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	/**
	* Roundcube webmail functions for the Elastic skin
	*
	* Copyright (c) The Roundcube Dev Team
	*
	* The contents are subject to the Creative Commons Attribution-ShareAlike
	* License. It is allowed to copy, distribute, transmit and to adapt the work
	* by keeping credits to the original autors in the README file.
	* See http://creativecommons.org/licenses/by-sa/3.0/ for details.
	*
	* @license magnet:?xt=urn:btih:90dc5c0be029de84e523b9b3922520e79e0e6f08&dn=cc0.txt CC0-1.0
	*/

	"use strict";

	function rcube_elastic_ui()
	{
	var prefs, ref = this,
	mode = 'normal', // one of: large, normal, small, phone
	color_mode = 'light', // 'light' or 'dark'
	touch = false,
	ios = false,
	popups_close_lock,
	is_framed = rcmail.is_framed(),
	env = {
	config: {
	standard_windows: rcmail.env.standard_windows,
	message_extwin: rcmail.env.message_extwin,
	compose_extwin: rcmail.env.compose_extwin,
	help_open_extwin: rcmail.env.help_open_extwin
	},
	checkboxes: 0,
	small_screen_config: {
	standard_windows: true,
	message_extwin: false,
	compose_extwin: false,
	help_open_extwin: false
	}
	},
	menus = {},
	content_buttons = [],
	frame_buttons = [],
	layout = {
	menu: $('#layout-menu'),
	sidebar: $('#layout-sidebar'),
	list: $('#layout-list'),
	content: $('#layout-content'),
	},
	buttons = {
	menu: $('a.task-menu-button'),
	back_sidebar: $('a.back-sidebar-button'),
	back_list: $('a.back-list-button'),
	back_content: $('a.back-content-button'),
	};


	// Public methods
	this.register_content_buttons = register_content_buttons;
	this.menu_hide = menu_hide;
	this.menu_toggle = menu_toggle;
	this.menu_destroy = menu_destroy;
	this.popup_init = popup_init;
	this.about_dialog = about_dialog;
	this.headers_dialog = headers_dialog;
	this.import_dialog = import_dialog;
	this.props_dialog = props_dialog;
	this.headers_show = headers_show;
	this.spellmenu = spellmenu;
	this.searchmenu = searchmenu;
	this.headersmenu = headersmenu;
	this.header_reset = header_reset;
	this.compose_status = compose_status;
	this.attachmentmenu = attachmentmenu;
	this.mailtomenu = mailtomenu;
	this.recipient_selector = recipient_selector;
	this.show_list = show_list;
	this.show_sidebar = show_sidebar;
	this.smart_field_init = smart_field_init;
	this.smart_field_reset = smart_field_reset;
	this.form_errors = form_errors;
	this.switch_nav_list = switch_nav_list;
	this.searchbar_init = searchbar_init;
	this.pretty_checkbox = pretty_checkbox;
	this.pretty_select = pretty_select;
	this.datepicker_init = datepicker_init;
	this.bootstrap_style = bootstrap_style;
	this.toggle_list_selection = toggle_list_selection;
	this.get_screen_mode = get_screen_mode;
	this.is_mobile = is_mobile;
	this.is_touch = is_touch;

	// Detect screen size/mode
	screen_mode();

	// Initialize layout
	layout_init();

	// Convert some elements to Bootstrap style
	bootstrap_style();

	// Initialize responsive toolbars (have to be before popups init)
	toolbar_init();

	// Initialize content frame and list handlers
	content_frame_init();

	// Initialize menu dropdowns
	dropdowns_init();

	// Setup various UI elements
	setup();

	// Update layout after initialization
	resize();


	/**
	* Setup procedure
	*/
	function setup()
	{
	var title, form, content_buttons = [];

	// Intercept jQuery-UI dialogs...
	$.ui && $.widget('ui.dialog', $.ui.dialog, {
	open: function() {
	// ... to unify min width for iframe'd dialogs
	if ($(this.element).is('.iframe')) {
	this.options.width = Math.max(576, this.options.width);
	}
	this._super();
	// ... to re-style them on dialog open
	dialog_open(this);
	return this;
	},
	close: function() {
	this._super();
	// ... to close custom select dropdowns on dialog close
	$('.select-menu:visible').remove();
	return this;
	}
	});

	// menu/sidebar/list button
	buttons.menu.on('click', function() { app_menu(true); return false; });
	buttons.back_sidebar.on('click', function() { show_sidebar(); return false; });
	buttons.back_list.on('click', function() { show_list(); return false; });
	buttons.back_content.on('click', function() { show_content(true); return false; });

	// Initialize search forms
	$('.searchbar').each(function() { searchbar_init(this); });

	// Set content frame title in parent window (exclude ext-windows and dialog frames)
	if (is_framed && !rcmail.env.extwin && !parent.$('.ui-dialog:visible').length) {
	if (title = $('h1.voice').first().text()) {
	parent.$('#layout-content > .header > .header-title:not(.constant)').text(title);
	}
	}
	else if (!is_framed) {
	title = layout.content.find('.boxtitle').first().detach().text();

	if (!title) {
	title = $('h1.voice').first().text();
	}

	if (title) {
	layout.content.find('.header > .header-title').text(title);
	}
	}

	// Add content frame toolbar in the footer, for content buttons and navigation
	if (!is_framed && layout.content.length && !layout.content.is('.no-navbar')
	&& !layout.content.children('.frame-content').length
	) {
	env.frame_nav = $('<div class="footer menu toolbar content-frame-navigation hide-nav-buttons">')
	.append($('<a class="button prev">')
	.append($('<span class="inner"></span>').text(rcmail.gettext('previous'))))
	.append($('<span class="buttons">'))
	.append($('<a class="button next">')
	.append($('<span class="inner"></span>').text(rcmail.gettext('next'))))
	.appendTo(layout.content);
	}

	// Move some buttons to the frame footer toolbar
	$('a[data-content-button]').each(function() {
	content_buttons.push(create_cloned_button($(this)));
	});

	// Move form buttons from the content frame into the frame footer (on parent window)
	$('.formbuttons').filter(function() { return !$(this).parent('.searchoptions').length; }).find('button').each(function() {
	var target = $(this);

	// skip non-content buttons
	if (!is_framed && !target.parents('#layout-content').length) {
	return;
	}

	if (target.is('.cancel')) {
	target.addClass('hidden');
	return;
	}

	content_buttons.push(create_cloned_button(target));
	});

	(is_framed ? parent.UI : ref).register_content_buttons(content_buttons);

	// Mail compose features
	if (form = rcmail.gui_objects.messageform) {
	form = $('form[name="' + form + '"]');
	// Show input elements with non-empty value
	// These event handlers need to be registered before rcmail 'init' event
	$('#_cc, #_bcc, #_replyto, #_followupto', $('.compose-headers')).each(function() {
	$(this).on('change', function() {
	$('#compose' + $(this).attr('id'))[this.value ? 'removeClass' : 'addClass']('hidden');
	});
	});

	// We put compose options outside of the main form
	// Because IE/Edge (<16) does not support 'form' attribute we'll copy
	// inputs into the main form as hidden fields
	// TODO: Consider doing this for IE/Edge only, just set the 'form' attribute on others
	$('#compose-options').find('textarea,input,select').each(function() {
	var hidden = $('<input>')
	.attr({type: 'hidden', name: $(this).attr('name')})
	.appendTo(form);

	$(this).attr('tabindex', 2)
	.on('change', function() {
	hidden.val(this.type != 'checkbox' \|\| this.checked ? $(this).val() : '');
	})
	.change();
	});
	}

	// Use smart recipient inputs
	// This have to be after mail compose feature above
	$('[data-recipient-input]').each(function() { recipient_input(this); });

	// Image upload widget
	$('.image-upload').each(function() { image_upload_input(this); });

	// Add HTML/Plain switcher on top of textarea with TinyMCE editor
	$('textarea[data-html-editor]').each(function() { html_editor_init(this); });

	$('#dragmessage-menu,#dragcontact-menu').each(function() {
	rcmail.gui_object('dragmenu', this.id);
	});

	// Taskmenu items added by plugins do not use elastic classes (e.g help plugin)
	// it's for larry skin compat. We'll assign 'selected' and icon-specific class.
	$('#taskmenu > a').each(function() {
	if (/button-([a-z]+)/.test(this.className)) {
	var data, name = RegExp.$1,
	button = find_button(this.id);

	if (button && (data = button.data)) {
	if (data.sel) {
	data.sel = data.sel.replace('button-selected', 'selected') + ' ' + name;
	}

	if (data.act) {
	data.act += ' ' + name;
	}

	rcmail.buttons[button.command][button.index] = data;
	rcmail.init_button(button.command, data);
	}

	$(this).addClass(name);
	$('.button-inner', this).addClass('inner');
	}

	$(this).on('mouseover', function() { rcube_webmail.long_subject_title(this, 0, $('span.inner', this)); });
	});

	// Some plugins use 'listbutton' class, we'll replace it with 'button'
	$('.listbutton').each(function() {
	var button = find_button(this.id);

	$(this).addClass('button').removeClass('listbutton');

	if (button.data.sel) {
	button.data.sel = button.data.sel.replace('listbutton', 'button');
	}
	if (button.data.act) {
	button.data.act = button.data.act.replace('listbutton', 'button');
	}

	rcmail.buttons[button.command][button.index] = button.data;
	rcmail.init_button(button.command, button.data);
	});

	// buttons that should be hidden on small screen devices
	$('[data-hidden]').each(function() {
	var m, v = $(this).data('hidden'),
	parent = $(this).parent('li'),
	re = /(large\|big\|small\|phone\|lbs)/g;

	while (m = re.exec(v)) {
	$(parent.length ? parent : this).addClass('hidden-' + m[1]);
	}
	});

	// Modify normal checkboxes on lists so they are different
	// than those used for row selection, i.e. use icons
	$('[data-list]').each(function() {
	$('input[type=checkbox]', this).each(function() { pretty_checkbox(this); });
	});

	// Assign .formcontainer class to the iframe body, when it
	// contains .formcontent and .formbuttons.
	if (is_framed) {
	$('.formcontent').each(function() {
	if ($(this).next('.formbuttons').length) {
	$(this).parent().addClass('formcontainer');
	}
	});
	}

	// move "Download all attachments" button into a better location
	$('#attachment-list + a.zipdownload').appendTo('.header-links');

	if (ios = $('html').is('.ipad,.iphone')) {
	$('.iframe-wrapper, .scroller').addClass('ios-scroll');
	}

	if ($('html').filter('.ipad,.iphone,.webkit.mobile,.webkit.tablet').addClass('webkit-scroller').length) {
	$(layout.menu).addClass('webkit-scroller');
	}

	// Set .notree class on treelist widget update
	$('.treelist').each(function() {
	var list = this, callback = function() {
	$(list)[$('.treetoggle', list).length > 0 ? 'removeClass' : 'addClass']('notree');
	};

	if (window.MutationObserver) {
	(new MutationObserver(callback)).observe(list, {childList: true, subtree: true});
	}
	callback();

	// Add title with full folder name on hover
	// TODO: This should be done in another way, so if an entry is
	// added after page load it also works there.
	$('li.mailbox > a').on('mouseover', function() { rcube_webmail.long_subject_title_ex(this); });
	});
	};

	/**
	* Moves form buttons into the content frame actions toolbar (for mobile)
	*/
	function register_content_buttons(buttons)
	{
	// we need these buttons really only in phone mode
	if (/mode == 'phone' && / env.frame_nav && buttons && buttons.length) {
	var toolbar = env.frame_nav.children('.buttons');

	content_buttons = [];
	$.each(buttons, function() {
	if (this.data('target')) {
	content_buttons.push(this.data('target'));
	}
	});

	toolbar.html('').append(buttons);
	}
	};

	/**
	* Registers cloned button
	*/
	function register_cloned_button(old_id, new_id, active_class)
	{
	var button = find_button(old_id);
	if (button) {
	rcmail.register_button(button.command, new_id, button.data.type, active_class, button.data.sel);
	}
	};

	/**
	* Create a button clone for use in toolbar
	*/
	function create_cloned_button(target, menu_button, add_class, always_active)
	{
	var popup, click = true,
	button = $('<a>'),
	target_id = target.attr('id') \|\| new Date().getTime(),
	button_id = target_id + '-clone',
	btn_class = target[0].className + (add_class ? ' ' + add_class : '');

	if (!menu_button) {
	btn_class = btn_class.replace('btn-primary', 'primary').replace(/(btn[a-z-]*\|button\|disabled)/g, '').trim()
	btn_class += ' button' + (!always_active ? ' disabled' : '');
	}
	else if (popup = target.data('popup')) {
	button.data({popup: popup, 'toggle-button': target.data('toggle-button')});
	popup_init(button[0]);
	click = false;
	rcmail.register_menu_button(button[0], popup);
	}

	button.attr({id: button_id, href: '#', 'class': btn_class})
	.append($('<span class="inner">').text(target.text()));

	if (click) {
	button.on('click', function(e) { target.click(); });
	}

	if (is_framed && !menu_button) {
	button.data('target', target);
	frame_buttons.push($.extend({button_id: button_id}, find_button(target[0].id)));
	}
	else {
	// Register the button to get active state updates
	register_cloned_button(target_id, button_id, btn_class.replace(' disabled', ''));
	}

	return button;
	};

	/**
	* Finds an rcmail button
	*/
	function find_button(id)
	{
	var i, button, command;

	for (command in rcmail.buttons) {
	for (i = 0; i < rcmail.buttons[command].length; i++) {
	button = rcmail.buttons[command][i];
	if (button.id == id) {
	return {
	command: command,
	index: i,
	data: button
	};
	}
	}
	}
	};

	/**
	* Setup environment
	*/
	function layout_init()
	{
	// Initialize light/dark mode
	color_mode_init();

	// Select current layout element
	env.last_selected = $('#layout > div.selected')[0];
	if (!env.last_selected && layout.content.length) {
	$.each(['sidebar', 'list', 'content'], function() {
	if (layout[this].length) {
	env.last_selected = layout[this][0];
	layout[this].addClass('selected');
	return false;
	}
	});
	}

	// Register resize handler
	$(window).on('resize', function() {
	clearTimeout(env.resize_timeout);
	env.resize_timeout = setTimeout(function() { resize(); }, 25);
	});

	// Enable rcmail.open_window intercepting
	env.open_window = rcmail.open_window;
	rcmail.open_window = window_open;

	rcmail
	.addEventListener('message', message_displayed)
	.addEventListener('menu-open', menu_toggle)
	.addEventListener('menu-close', menu_toggle)
	.addEventListener('editor-init', tinymce_init)
	.addEventListener('autocomplete_create', rcmail_popup_init)
	.addEventListener('googiespell_create', rcmail_popup_init)
	.addEventListener('setquota', update_quota)
	.addEventListener('enable-command', enable_command_handler)
	.addEventListener('destroy-entity-selector', function(o) { menu_destroy(o.name); })
	.addEventListener('clonerow', pretty_checkbox_fix)
	.addEventListener('init', init);

	// Create floating action button(s)
	if ((layout.list.length \|\| layout.content.length) && is_mobile()) {
	var fabuttons = [];

	$('[data-fab]').each(function() {
	var button = $(this),
	task = button.data('fab-task') \|\| '*',
	action = button.data('fab-action') \|\| '*';

	if ((task == '*' \|\| task == rcmail.env.task)
	&& (action == '*' \|\| action == rcmail.env.action \|\| (action == 'none' && !rcmail.env.action))
	) {
	fabuttons.push(create_cloned_button(button, false, false, true));
	}
	});

	if (fabuttons.length) {
	$('<div class="floating-action-buttons">').append(fabuttons)
	.appendTo(layout.list.length ? layout.list : layout.content);
	}
	}

	// Initialize column resizers (must be after floating buttons)
	if (layout.sidebar.length) {
	splitter_init(layout.sidebar);
	}

	if (layout.list.length) {
	splitter_init(layout.list);
	}
	};

	/**
	* rcmail 'init' event handler
	*/
	function init()
	{
	// Additional functionality on list widgets
	$('[data-list]').filter('ul,table').each(function() {
	var table = $(this),
	list = table.data('list');

	if (rcmail[list] && rcmail[list].multiselect) {
	var repl, button,
	parent = table.parents('layout-sidebar,#layout-list,#layout-content').last(),
	header = parent.find('.header'),
	toolbar = header.find('ul');

	if (!toolbar.length) {
	toolbar = header;
	}
	else if (button = toolbar.find('a.select').data('toggle-button')) {
	button = $('#' + button);
	}

	// Enable checkbox selection on list widgets
	rcmail[list].enable_checkbox_selection();

	if (get_pref('list-selection') === true) {
	table.addClass('withselection');
	}

	// Add Select button to the list navigation bar
	if (!button) {
	button = $('<a>').attr({'class': 'button selection disabled', role: 'button', title: rcmail.gettext('select')})
	.on('click', function() { UI.toggle_list_selection(this, table.attr('id')); })
	.append($('<span class="inner">').text(rcmail.gettext('select')));

	if (toolbar.is('.menu')) {
	button.prependTo(toolbar).wrap('<li role="menuitem">');

	// Add a button to the content toolbar menu too
	if (layout.content) {
	var button2 = create_cloned_button(button, true, 'hidden-big hidden-large');
	$('<li role="menuitem">').append(button2).appendTo('#toolbar-menu');
	button = button.add(button2);
	}
	}
	else {
	if (repl = table.data('list-select-replace')) {
	$(repl).replaceWith(button);
	}
	else {
	button.appendTo(toolbar).addClass('icon');
	if (!parent.is('#layout-sidebar')) {
	button.addClass('toolbar-button');
	}
	}
	}
	}

	// Update Select button state on list update
	rcmail.addEventListener('listupdate', function(prop) {
	if (prop.list && prop.list == rcmail[list]) {
	if (prop.rowcount) {
	button.addClass('active').removeClass('disabled').attr('tabindex', 0);
	}
	else {
	button.removeClass('active').addClass('disabled').attr('tabindex', -1);
	}
	}
	});
	}

	// https://github.com/roundcube/elastic/issues/45
	// Draggable blocks scrolling on touch devices, we'll disable it there
	if (touch && rcmail[list]) {
	if (typeof rcmail[list].draggable == 'function') {
	rcmail[list].draggable('destroy');
	}
	else if (typeof rcmail[list].draggable == 'boolean') {
	rcmail[list].draggable = false;
	}

	// Also disable double-click to prevent from opening items
	// in a new page, and prevent from zoom issues (#7732)
	rcmail[list].dblclick_time = 0;
	}
	});

	// Display "List is empty..." on the list
	if (window.MutationObserver) {
	$('[data-label-msg]').filter('ul,table').each(function() {
	var info = $('<div class="listing-info hidden">').insertAfter(this),
	table = $(this),
	fn = function() {
	var ext, command,
	msg = table.data('label-msg'),
	list = table.is('ul') ? table : table.children('tbody');

	if (!rcmail.env.search_request && !rcmail.env.qsearch
	&& msg && !list.children(':visible').length
	) {
	ext = table.data('label-ext');
	command = table.data('create-command');

	if (ext && (!command \|\| rcmail.commands[command])) {
	msg += ' ' + ext;
	}

	info.text(msg).removeClass('hidden');
	return;
	}

	info.addClass('hidden');
	},
	callback = function() {
	// wait until the UI stops loading and the list is visible
	if (rcmail.busy \|\| !table.is(':visible')) {
	return setTimeout(callback, 250);
	}

	clearTimeout(env.list_timer);
	env.list_timer = setTimeout(fn, 50);
	};

	// show/hide the message when something changes on the list
	var observer = new MutationObserver(callback);
	observer.observe(table[0], {childList: true, subtree: true, attributes: true, attributeFilter: ['style']});

	// initialize the message
	callback();
	});
	}

	// Add menu link for each attachment
	if (rcmail.env.action != 'print') {
	$('#attachment-list > li').each(function() {
	attachmentmenu_append(this);
	});
	}

	var phone_confirmation = function(label) {
	if (mode == 'phone') {
	rcmail.display_message(rcmail.gettext(label), 'confirmation');
	}
	};

	rcmail.addEventListener('fileappended', function(e) {
	if (e.attachment.complete) {
	attachmentmenu_append(e.item);
	if (e.attachment.mimetype == 'text/vcard' && rcmail.commands['attach-vcard']) {
	phone_confirmation('vcard_attachments.vcardattached');
	}
	}
	})
	.addEventListener('managesieve.insertrow', function(o) { bootstrap_style(o.obj); })
	.addEventListener('add-recipient', function() { phone_confirmation('recipientsadded'); });

	rcmail.init_pagejumper('.pagenav > input');

	if (rcmail.task == 'mail') {
	if (rcmail.env.action == 'compose') {
	rcmail.addEventListener('compose-encrypted', function(e) {
	$("a.mode-html, button.attach").prop('disabled', e.active);
	$('a.attach, a.responses:not(.edit)')[e.active ? 'addClass' : 'removeClass']('disabled');
	});

	$('#layout-sidebar > .footer:not(.pagenav) > a.button').click(function() {
	if ($(this).is('.disabled')) {
	rcmail.display_message(rcmail.gettext('nocontactselected'), 'warning');
	}
	});

	// Update compose status bar on attachments list update
	if (window.MutationObserver) {
	var observer, list = $('#attachment-list'),
	status_callback = function() { compose_status('attach', list.children().length > 0); };

	observer = new MutationObserver(status_callback);
	observer.observe(list[0], {childList: true});
	status_callback();
	}
	}

	// In compose/preview window we do not provide "Back" button, instead
	// we modify the "Mail" button in the task menu to act like it (i.e. calls 'list' command)
	if (!rcmail.env.extwin && (rcmail.env.action == 'compose' \|\| rcmail.env.action == 'show')) {
	$('a.mail', layout.menu).attr({
	'aria-disabled': false,
	onclick: "return rcmail.command('list','',this,event);"
	});
	}

	// Append contact menu to all mailto: links
	if (rcmail.env.action == 'preview' \|\| rcmail.env.action == 'show') {
	$('a').filter('[href^="mailto:"]').each(function() {
	mailtomenu_append(this);
	});

	// restore headers view to last state
	headers_show();
	}
	}
	else if (rcmail.task == 'settings') {
	rcmail.addEventListener('identity-encryption-show', function(p) {
	bootstrap_style(p.container);
	});
	rcmail.addEventListener('identity-encryption-update', function(p) {
	bootstrap_style(p.container);
	});
	}

	rcmail.set_env({
	thread_padding: '1.5rem',
	// increase popup windows, so they do not switch to tablet mode
	popup_width_small: 1025,
	popup_width: 1200
	});

	// Update layout after initialization (again)
	// In devel mode we have to wait until all styles are applied by less
	if (rcmail.env.devel_mode && window.less) {
	less.pageLoadFinished.then(function() {
	resize();
	// Re-focus the focused input field on mail compose
	if (rcmail.env.compose_focus_elem) {
	$(rcmail.env.compose_focus_elem).focus();
	}
	});
	}
	else {
	resize();
	}

	// Add date format placeholder to datepicker inputs
	var func, format = rcmail.env.date_format_localized;
	if (format) {
	func = function(input) {
	$(input).filter('.datepicker').attr('placeholder', format);
	// also make selects pretty
	$(input).parent().find('select').each(function() { pretty_select(this); });
	};

	$('input.datepicker').each(function() { func(this); });
	rcmail.addEventListener('insert-edit-field', func);
	}
	};

	/**
	* Initializes light/dark mode
	*/
	function color_mode_init()
	{
	if (rcmail.env.action == 'print') {
	return;
	}

	// We deliberately use only cookies here, not local storage
	var pref = rcmail.get_cookie('colorMode'),
	color_scheme = window.matchMedia('(prefers-color-scheme: dark)'),
	reset_cookie = function() {
	rcmail.set_cookie('colorMode', '', new Date()); // delete the cookie
	},
	switch_iframe_color_mode = function() {
	try {
	$(this.contentWindow.document).find('html')[color_mode == 'dark' ? 'addClass' : 'removeClass']('dark-mode');
	}
	catch(e) { /* ignore */ }
	},
	switch_color_mode = function() {
	if (color_mode == 'dark') {
	$('#taskmenu a.theme').removeClass('dark').addClass('light').find('span').text(rcmail.gettext('lightmode'));
	$('html').addClass('dark-mode');
	}
	else {
	$('#taskmenu a.theme').removeClass('light').addClass('dark').find('span').text(rcmail.gettext('darkmode'));
	$('html').removeClass('dark-mode');
	}

	screen_logo(mode);
	$('iframe').each(switch_iframe_color_mode);
	};

	if (rcmail.env.dark_mode_support === false) {
	if (pref == 'dark') {
	reset_cookie();
	$('iframe').each(switch_iframe_color_mode);
	}
	return;
	}

	// Add onclick action to the menu button
	$('#taskmenu a.theme').on('click', function() {
	color_mode = $(this).is('.dark') ? 'dark' : 'light';
	switch_color_mode();
	rcmail.set_cookie('colorMode', color_mode, false);
	});

	// Note: this does not work in IE and Safari
	color_scheme.addListener(function(e) {
	color_mode = e.matches ? 'dark' : 'light';
	switch_color_mode();
	reset_cookie();
	});

	if (pref) {
	color_mode = pref;
	}
	else if (color_scheme.matches) {
	color_mode = 'dark';
	}

	switch_color_mode();

	$('iframe').on('load', switch_iframe_color_mode);
	};

	/**
	* Apply bootstrap classes to html elements
	*/
	function bootstrap_style(context)
	{
	if (!context) {
	context = document;
	}

	// Buttons
	$('input.button,button', context).not('.btn').addClass('btn').not('.btn-primary,.primary,.mainaction').addClass('btn-secondary');
	$('input.button.mainaction,button.primary,button.mainaction', context).addClass('btn-primary');
	$('button.btn.delete,button.btn.discard', context).addClass('btn-danger');

	$.each(['warning', 'error', 'information', 'confirmation'], function() {
	var type = this;
	$('.box' + type + ':not(.ui.alert)', context).each(function() {
	alert_style(this, type, true);
	});
	});

	// Convert structure of single dialogs (one input or just an image),
	// e.g. group create, attachment rename where we use <label>Label<input></label>
	if (context != document && $('.popup', context).children().length == 1) {
	var content = $('.popup', context).children().first();
	if (content.is('img')) {
	$('.popup', context).addClass('justified');
	}
	else if (content.is('label')) {
	var input = content.find('input').detach(),
	label = content.detach(),
	id = input.attr('id');

	if (!id) {
	input.attr('id', id = 'dialog-input-elastic');
	}

	$('.popup', context).addClass('formcontent').append(
	$('<div class="form-group row">')
	.append(label.attr('for', id).addClass('col-sm-2 col-form-label'))
	.append($('<div class="col-sm-10">').append(input))
	);

	input.focus();
	}
	}

	// Forms
	var supported_controls = 'input:not(.button,.no-bs,[type=button],[type=radio],[type=checkbox],[type=file]),textarea';
	$(supported_controls, $('.propform', context)).addClass('form-control');
	$('[type=checkbox]', $('.propform', context)).addClass('form-check-input');

	// Note: On selects we add form-control to get consistent focus
	// and to not have to create separate rules for selects and inputs
	$('select', context).addClass('form-control custom-select');

	if (context != document) {
	$(supported_controls, context).addClass('form-control');
	}

	$('table.propform', context).each(function() {
	var text_rows = 0, form_rows = 0;
	var col_sizes = ['sm', 4, 8];

	if ($(this).attr('class').match(/cols-([a-z]+)-(\d)-(\d)/)) {
	col_sizes = [RegExp.$1, RegExp.$2, RegExp.$3];
	}

	$(this).find('> tbody > tr, > tr').each(function() {
	var first, last, row = $(this),
	row_classes = ['form-group', 'row'],
	cells = row.children('td');

	if (cells.length == 2) {
	first = cells.first();
	last = cells.last();

	$('label', first).addClass('col-form-label');
	first.addClass('col-' + col_sizes[0] + '-' + col_sizes[1]);
	last.addClass('col-' + col_sizes[0] + '-' + col_sizes[2]);

	if (last.find('[type=checkbox]').length == 1 && !last.find('.proplist').length) {
	row_classes.push('form-check');

	if (last.find('a').length) {
	row_classes.push('with-link');
	}

	form_rows++;
	}
	else if (!last.find('input:not([type=hidden]),textarea,radio,select').length) {
	last.addClass('form-control-plaintext');
	text_rows++;
	}
	else {
	form_rows++;
	}

	// style some multi-input fields
	if (last.children('.datepicker') && last.children('input').length == 2) {
	last.addClass('datetime');
	}
	}
	else if (cells.length == 1) {
	cells.css('width', '100%');
	}

	row.addClass(row_classes.join(' '));
	});

	if (text_rows > form_rows) {
	$(this).addClass('text-only');
	}
	});

	// Special input + anything entry
	$('td.input-group', context).each(function() {
	$(this).children().slice(1).addClass('input-group-append');
	});

	// Other forms, e.g. Contact advanced search
	$('fieldset.propform:not(.grouped) div.row', context).each(function() {
	var has_input = $('input:not([type=hidden]),select,textarea', this).length > 0;

	if (has_input) {
	$(supported_controls, this).addClass('form-control');
	}

	$(this).children().last().addClass('col-sm-8' + (!has_input ? ' form-control-plaintext' : ''));
	$(this).children().first().addClass('col-sm-4 col-form-label');
	$(this).addClass('form-group');
	});

	// Contact info/edit form
	$('fieldset.propform.grouped fieldset', context).each(function() {
	$('.row', this).each(function() {
	var label, first,
	has_input = $('input,select,textarea', this).length > 0,
	items = $(this).children();

	if (has_input) {
	$(supported_controls, this).addClass('form-control');
	}

	if (items.length < 2) {
	return;
	}

	first = items.first();
	if (first.is('select')) {
	first.addClass('input-group-prepend');
	}
	else {
	first.wrap('<span class="input-group-prepend">').addClass('input-group-text');
	}

	if (!has_input) {
	items.last().addClass('form-control-plaintext');
	}

	$('.content', this).addClass('input-group-prepend input-group-append input-group-text');
	$('a.deletebutton', this).addClass('input-group-text icon delete').wrap('<span class="input-group-append">');
	$(this).addClass('input-group');
	});
	});

	// Advanced options form
	$('fieldset.advanced', context).each(function() {
	var table = $(this).children('.propform').first();
	table.wrap($('<div>').addClass('collapse'));
	$(this).children('legend').first().addClass('closed').on('click', function() {
	table.parent().collapse('toggle');
	$(this).toggleClass('closed');
	});
	});

	// Other forms, e.g. Insert response
	$('.propform > .prop.block:not(.row)', context).each(function() {
	$(this).addClass('form-group row').each(function() {
	$('label', this).addClass('col-form-label').wrap($('<div class="col-sm-4">'));
	$('input,select,textarea', this).wrap($('<div class="col-sm-8">'));
	$(supported_controls, this).addClass('form-control');
	});
	});

	$('td.rowbuttons > a', context).addClass('btn');

	// Testing Bootstrap Tabs on contact info/edit page
	// Tabs do not scale nicely on very small screen, so can be used
	// only with small number of tabs with short text labels
	$('form.tabbed,div.tabbed', context).each(function(idx, item) {
	var tabs = [], nav = $('<ul>').attr({'class': 'nav nav-tabs', role: 'tablist'});

	$(this).addClass('tab-content').children('fieldset').each(function(i, fieldset) {
	var tab, id = fieldset.id \|\| ('tab' + idx + '-' + i),
	tab_class = $(fieldset).data('navlink-class');

	$(fieldset).addClass('tab-pane').attr({id: id, role: 'tabpanel'});

	tab = $('<li>').addClass('nav-item').append(
	$('<a>').addClass('nav-link' + (tab_class ? ' ' + tab_class : ''))
	.attr({role: 'tab', 'href': '#' + id})
	.text($('legend', fieldset).first().text())
	.click(function(e) {
	$(this).tab('show');
	// Because we return false we have to close popups
	popups_close(e);
	// Returning false here prevents from strange scrolling issue
	// when the form is in an iframe, e.g. contact edit form
	return false;
	})
	);

	$('legend', fieldset).first().hide();
	tabs.push(tab);
	});

	// create the navigation bar
	nav.append(tabs).insertBefore(item);
	// activate the first tab
	$('a.nav-link', nav).first().click();
	});

	$('input[type=file]:not(.custom-file-input)', context).each(function() {
	var label_text = rcmail.gettext('choosefile' + (this.multiple ? 's' : '')),
	label = $('<label>').attr({'class': 'custom-file-label',
	'data-browse': rcmail.gettext('browse')}).text(label_text);

	$(this).addClass('custom-file-input').wrap('<div class="custom-file">');
	$(this).on('change', function() {
	var text = label_text;
	if (this.files.length) {
	text = this.files[0].name;
	if (this.files.length > 1) {
	text += ', ...';
	}
	}

	// Note: We don't use label variable to allow cloning of the input
	$(this).next().text(text);
	})
	.parent().append(label);
	});

	// Make tables prettier
	$('table:not(.table,.compact-table,.propform,.listing,.ui-datepicker-calendar)', context)
	.filter(function() {
	// exclude direct propform children and external content
	return !$(this).parent().is('.propform')
	&& !$(this).parents('#message-header,.message-htmlpart,.message-partheaders,.boxinformation,.raw-tables').length;
	})
	.each(function() {
	// TODO: Consider implementing automatic setting of table-responsive on window resize
	var table = $(this).addClass('table');
	table.parent().addClass('table-responsive-sm');
	table.find('thead').addClass('thead-default');
	});

	// The same for some other checkboxes
	// We do this here, not in setup() because we want to cover dialogs
	$('input.pretty-checkbox, .propform input[type=checkbox], .form-check input[type=checkbox], .popupmenu.form input[type=checkbox], .menu input[type=checkbox]', context)
	.each(function() { pretty_checkbox(this); });

	// Also when we add action-row of the form, e.g. Managesieve plugin adds them after the page is ready
	if ($(context).is('.actionrow')) {
	$('input[type=checkbox]', context).each(function() { pretty_checkbox(this); });
	}

	// Input-group combo is an element with a select field on the left
	// and input(s) on right, and where the whole right side can be hidden
	// depending on the select position. This code fixes border radius on select
	$('.input-group-combo > select', context).first().on('change', function() {
	var select = $(this),
	fn = function() {
	select[select.next().is(':visible') ? 'removeClass' : 'addClass']('alone');
	};

	setTimeout(fn, 50);
	setTimeout(fn, 2000); // for devel mode
	}).trigger('change');

	// Make message-objects alerts pretty (the same as UI alerts)
	$('#message-objects', context).children(':not(.ui.alert)').add('.part-notice').each(function() {
	// message objects with notice class are really warnings
	var cl = String($(this).removeClass('notice part-notice').attr('class')).split(/\s/)[0] \|\| 'warning';
	alert_style(this, cl);
	$(this).addClass('box' + cl);
	$('a', this).addClass('btn btn-primary btn-sm');
	});

	// Form validation errors (managesieve plugin)
	$('.error', context).addClass('is-invalid');

	// Make logon form prettier
	if (rcmail.env.task == 'login' && context == document) {
	$('#rcmloginsubmit').addClass('btn-lg text-uppercase w-100');
	$('#rcmloginoauth').addClass('btn btn-secondary btn-lg w-100');
	$('#login-form table tr').each(function() {
	var input = $('input,select', this),
	label = $('label', this),
	icon_name = input.data('icon'),
	icon = $('<i>').attr('class', 'input-group-text icon ' + input.attr('name').replace('_', ''));

	if (icon_name) {
	icon.addClass(icon_name);
	}

	$(this).addClass('form-group row');
	label.parent().css('display', 'none');
	input.addClass(input.is('select') ? 'custom-select' : 'form-control')
	.attr('placeholder', label.text())
	.before($('<span class="input-group-prepend">').append(icon))
	.parent().addClass('input-group input-group-lg');
	});
	}

	$('select:not([multiple])', context).each(function() { pretty_select(this); });
	};

	/**
	* Initializes popup menus
	*/
	function dropdowns_init()
	{
	$('[data-popup]').each(function() { popup_init(this); });

	$(document).on('click', popups_close);
	rcube_webmail.set_iframe_events({mousedown: popups_close, touchstart: popups_close});
	};

	/**
	* Init content frame
	*/
	function content_frame_init()
	{
	if (!layout.list.length) {
	return;
	}

	var last_selected = env.last_selected,
	title_reset = function(title) {
	if (typeof title !== 'string' \|\| !title.length) {
	title = $('h1.voice').text() \|\| $('title').text() \|\| '';
	}

	layout.content.find('.header > .header-title').text(title);
	};

	// display or reset the content frame
	var common_content_handler = function(e, href, show, title)
	{
	if (is_mobile() && env.frame_nav) {
	content_frame_navigation(href, e);
	}

	if (show && !layout.content.is(':visible')) {
	env.last_selected = layout.content[0];
	}
	else if (!show && env.last_selected != last_selected && !env.content_lock) {
	env.last_selected = last_selected;
	}

	screen_resize();

	title_reset(title && show ? title : null);

	env.content_lock = false;
	};

	var common_list_handler = function(e) {
	if (mode != 'large' && !env.content_lock && e.force) {
	show_list();
	}

	env.content_lock = false;

	// display current folder name in list header
	if (e.title) {
	$('.header > .header-title', layout.list).text(e.title);
	}
	};

	var list_handler = function(e) {
	var args = {};

	if (rcmail.env.task == 'addressbook' \|\| rcmail.env.task == 'mail') {
	args.force = true;
	}

	// display current folder name in list header
	if (rcmail.env.task == 'mail' && !rcmail.env.action) {
	var name = $.type(e) == 'string' ? e : rcmail.env.mailbox,
	folder = rcmail.env.mailboxes[name];

	args.title = folder ? folder.name : '';
	}

	common_list_handler(args);
	};

	// when loading content-frame in small-screen mode display it
	layout.content.find('iframe').on('load', function(e) {
	var win, href = '', show = true;

	// Reset the scroll position of the iframe-wrapper
	$(this).parent('.iframe-wrapper').scrollTop(0);

	try {
	win = e.target.contentWindow;
	href = win.location.href;
	show = !href.endsWith(rcmail.env.blankpage);

	// Reset title back to the default
	$(win).on('unload', title_reset);
	}
	catch(e) { /* ignore */ }

	common_content_handler(e, href, show);
	});

	rcmail
	.addEventListener('afterlist', list_handler)
	.addEventListener('afterlistgroup', list_handler)
	.addEventListener('afterlistsearch', list_handler)
	// plugins
	.addEventListener('show-list', function(e) {
	e.force = true;
	common_list_handler(e);
	})
	.addEventListener('show-content', function(e) {
	if (e.obj && !$(e.obj).is('iframe')) {
	$(e.scrollElement \|\| e.obj).scrollTop(0);
	if (is_mobile()) {
	iframe_loader(e.obj);
	}
	}

	common_content_handler(e.event \|\| new Event, '_action=' + (e.mode \|\| 'edit'), true, e.title);
	});
	};

	/**
	* Content frame navigation
	*/
	function content_frame_navigation(href, event)
	{
	// Don't display navigation for create/add action frames
	if (href.match(/_action=(create\|add)/) \|\| href.match(/_nav=hide/)) {
	$(env.frame_nav).addClass('hide-nav-buttons');
	return;
	}

	var node, uid, list, _list = $('[data-list]', layout.list).data('list');

	if (!_list \|\| !(list = rcmail[_list])) {
	// hide navbar if there are no visible buttons, e.g. Help plugin UI
	if ($(env.frame_nav).is('.hide-nav-buttons') && !$('.buttons', env.frame_nav).children().length) {
	$(env.frame_nav).addClass('hidden');
	}
	return;
	}

	$(env.frame_nav).removeClass('hide-nav-buttons hidden');

	// expand collapsed row so we do not skip the whole thread
	// TODO: Unified interface for list and treelist widgets
	if (uid = list.get_single_selection()) {
	if (list.rows && list.rows[uid] && !list.rows[uid].expanded) {
	list.expand_row(event, uid);
	}
	else if (list.get_node && (node = list.get_node(uid)) && node.collapsed) {
	list.expand(uid);
	}
	}

	var prev, next,
	frame = $('#' + rcmail.env.contentframe),
	next_button = $('a.button.next', env.frame_nav).off('click').addClass('disabled'),
	prev_button = $('a.button.prev', env.frame_nav).off('click').addClass('disabled');

	if ((next = list.get_next()) \|\| rcmail.env.current_page < rcmail.env.pagecount) {
	next_button.removeClass('disabled').on('click', function() {
	env.content_lock = true;
	iframe_loader(frame);

	if (next) {
	list.select(next);
	}
	else {
	rcmail.env.list_uid = 'FIRST';
	rcmail.command('nextpage');
	}
	});
	}

	if (((prev = list.get_prev()) && (prev != '*' \|\| _list != 'subscription_list')) \|\| rcmail.env.current_page > 1) {
	prev_button.removeClass('disabled').on('click', function() {
	env.content_lock = true;
	iframe_loader(frame);

	if (prev) {
	list.select(prev);
	}
	else {
	rcmail.env.list_uid = 'LAST';
	rcmail.command('previouspage');
	}
	});
	}
	};

	/**
	* Handler for editor-init event
	*/
	function tinymce_init(o)
	{
	var onload = [],
	is_editor = $('#' + o.id).parent().is('.html-editor');

	// Enable autoresize plugin
	o.config.plugins += ' autoresize';

	if (is_touch()) {
	// Use minimalistic toolbar
	o.config.toolbar = 'undo redo \| link image styleselect';
	}

	if (rcmail.task == 'mail' && rcmail.env.action == 'compose') {
	var floating = false,
	form = $('#compose-content > form'),
	keypress = function(e) {
	if (e.key == 'Tab' && e.shiftKey) {
	$('#compose-content > form').scrollTop(0);
	}
	};

	// Shift+Tab on mail compose editor scrolls the page to the top
	onload.push(function(ed) {
	ed.on('keypress', keypress);
	});

	$('#composebody').on('keypress', keypress);

	// Keep the editor toolbar on top of the screen on scroll
	form.on('scroll', function() {
	var container = $('.tox-editor-container', form),
	toolbar = container.find('.tox-toolbar-overlord'),
	editor_offset = container.offset(),
	header_top = form.offset().top;

	if (editor_offset && (editor_offset.top - header_top < 0)) {
	toolbar.css({position: 'fixed', top: header_top + 'px', width: container.width() + 'px'});
	floating = true;
	}
	else {
	// Focusing the subject when scrolling back to the top fixes
	// an annoying bouncing scrollbar bug (#8046)
	if (floating) {
	$('#compose-subject').focus();
	floating = false;
	}
	toolbar.css({position: 'relative', top: 0, width: 'auto'})
	}
	});

	$(window).resize(function() { form.trigger('scroll'); });
	}

	if (is_editor) {
	o.config.toolbar = 'plaintext \| ' + o.config.toolbar;
	// Use setup_callback, we can't use editor-load event
	o.config.setup_callback = function(ed) {
	ed.ui.registry.addButton('plaintext', {
	tooltip: rcmail.gettext('plaintoggle'),
	icon: 'close',
	onAction: function(e) {
	if (rcmail.command('toggle-editor', {id: ed.id, html: false}, '', e.originalEvent)) {
	$('#' + ed.id).parent().removeClass('ishtml');
	}
	}
	});
	};
	}

	// Add styling for TinyMCE dialogs
	onload.push(function(ed) {
	ed.on('OpenWindow', function(e) {
	var dialog = $('.tox-dialog:last')[0],
	callback = function(e) {
	var body = $(dialog).find('.tox-dialog__body'),
	foot = $(dialog).find('.tox-dialog__footer'),
	buttons = foot.find('button');

	if (!e) {
	// Fix icons in Find and Replace dialog footer
	if (buttons.length === 4) {
	body.closest('.tox-dialog').addClass('tox-search-dialog');
	}
	// Switch Save and Cancel buttons order
	else if (buttons.length == 2) {
	buttons.first().insertAfter(buttons[1]);
	}

	// TODO: Styling form elements does not work well because of
	// https://github.com/tinymce/tinymce/issues/4867
	// also https://github.com/tinymce/tinymce/issues/4869
	}

	body.find('.tox-checkbox > input').each(function() { pretty_checkbox(this); });
	body.find('.tox-textarea,.tox-textfield').addClass('form-control');
	};

	// TODO: Maybe some day we'll not have to use MutationObserver
	// https://github.com/tinymce/tinymce/issues/4869
	if (window.MutationObserver) {
	(new MutationObserver(callback)).observe($('.tox-dialog__body-content', dialog)[0], {childList: true});
	}
	callback();
	});
	});

	rcmail.addEventListener('editor-load', function(e) {
	$.each(onload, function() { this(e.ref.editor); });
	});
	};

	function datepicker_init(datepicker)
	{
	// Datepicker widget improvements: overlay element, styling updates on calendar element update
	// The widget does not provide any event system, so we use MutationObserver
	if (window.MutationObserver) {
	$(datepicker).not('[data-observed]').each(function() {
	var overlay, hidden = true,
	win = is_framed ? parent : window,
	callback = function(data) {
	$.each(data, function(i, v) {
	// add/remove overlay on widget show/hide
	if (v.type == 'attributes') {
	var is_hidden = $(v.target).attr('aria-hidden') == 'true';
	if (is_hidden != hidden) {
	if (!is_hidden) {
	overlay = $('<div>').attr('class', 'ui-widget-overlay datepicker')
	.appendTo(win.document.body)
	.click(function(e) {
	$(this).remove();
	if (is_framed) {
	$.datepicker._hideDatepicker();
	}
	});
	}
	else if (overlay) {
	overlay.remove();
	}
	hidden = is_hidden;
	}
	}
	else if (v.addedNodes.length) {
	// apply styles when widget content changed
	win.UI.bootstrap_style(v.target);

	// Month/Year change handlers do not work from parent, fix it
	if (is_framed) {
	win.$('select.ui-datepicker-month', v.target).on('change', function() {
	$.datepicker._selectMonthYear($.datepicker._lastInput, this, "M");
	});
	win.$('select.ui-datepicker-year', v.target).on('change', function() {
	$.datepicker._selectMonthYear($.datepicker._lastInput, this, "Y");
	});
	}
	}
	});
	};

	$(this).attr('data-observed', '1');

	if (is_framed) {
	// move the datepicker to parent window
	$(this).detach().appendTo(parent.document.body);

	// create fake element, so the valid one is not removed by datepicker code
	$('<div id="ui-datepicker-div" class="hidden">').appendTo(document.body);
	}

	(new MutationObserver(callback)).observe(this, {childList: true, subtree: false, attributes: true, attributeFilter: ['aria-hidden']});
	});
	}
	};

	function toggle_list_selection(obj, list_id)
	{
	if ($(obj).is('.active')) {
	set_pref(
	'list-selection',
	$('#' + list_id).toggleClass('withselection').is('.withselection')
	);
	}
	};

	/**
	* Handler for some Roundcube core popups
	*/
	function rcmail_popup_init(o)
	{
	// Add some common styling to the autocomplete/googiespell popups
	$('ul', o.obj).addClass('menu listing iconized');
	$(o.obj).addClass('popupmenu popover');
	bootstrap_style(o.obj);

	// for googiespell list
	$('input', o.obj).addClass('form-control');

	// Modify the googiespell menu on mobile
	if (is_mobile() && $(o.obj).is('.googie_window')) {
	// Set popup Close title
	var title = rcmail.gettext('close'),
	class_name = 'button icon cancel',
	close_link = $('<a>').attr('class', class_name).text(title)
	.click(function(e) {
	e.stopPropagation();
	$('.popover-overlay').remove();
	$(o.obj).hide();
	});

	$('<h3 class="popover-header">').append(close_link).prependTo(o.obj);

	// add overlay element for phone layout
	if (!$('.popover-overlay').length) {
	$('<div>').attr('class', 'popover-overlay')
	.appendTo('body')
	.click(function() { $(this).remove(); });
	}

	$('ul,button', o.obj).click(function(e) {
	if (!$(e.target).is('input')) {
	$('.popover-overlay').remove();
	}
	});
	}
	};

	/**
	* Handler for 'enable-command' event
	*/
	function enable_command_handler(args)
	{
	if (is_framed) {
	$.each(frame_buttons, function(i, button) {
	if (args.command == button.command) {
	parent.$('#' + button.button_id)[args.status ? 'removeClass' : 'addClass']('disabled');
	}
	});
	}

	if (rcmail.task == 'mail') {
	switch (args.command) {
	case 'reply-list':
	if (rcmail.env.reply_all_mode == 1) {
	var label = rcmail.gettext(args.status ? 'replylist' : 'replyall');
	$('.toolbar a.reply-all').attr('title', label).find('.inner').text(label);
	}
	break;

	case 'compose-encrypted':
	// show the toolbar button for Mailvelope
	$('.toolbar a.encrypt').parent().show();
	break;

	case 'compose-encrypted-signed':
	// enable selector for encrypt and sign
	$('#encryption-menu-button').show();
	break;
	}
	}
	};

	/**
	* screen mode
	*/
	function screen_mode()
	{
	var size, width = $(window).width();

	if (width <= 480)
	size = 'phone';
	else if (width > 1200)
	size = 'large';
	else if (width > 768)
	size = 'normal';
	else
	size = 'small';

	touch = width <= 1024;
	mode = size;
	};

	/**
	* Get current screen mode
	*/
	function get_screen_mode()
	{
	return mode;
	};

	/**
	* Window resize handler
	* Does layout reflows e.g. on screen orientation change
	*/
	function resize()
	{
	var mobile;

	screen_mode();
	screen_resize();
	screen_resize_html();

	// disable ext-windows and other features
	if (mobile = is_mobile()) {
	rcmail.set_env(env.small_screen_config);
	rcmail.enable_command('extwin', false);
	}
	else {
	rcmail.set_env(env.config);
	rcmail.enable_command('extwin', true);
	}

	// Hide content frame buttons on small devices (with frame toolbar in parent window)
	$.each(content_buttons, function() { $(this)[mobile ? 'hide' : 'show'](); });

	rcmail.triggerEvent('skin-resize', { mode: mode })
	};

	function screen_resize()
	{
	if (is_framed && !layout.sidebar.length && !layout.list.length) {
	screen_resize_headers();
	return;
	}

	switch (mode) {
	case 'phone': screen_resize_phone(); break;
	case 'small': screen_resize_small(); break;
	case 'normal': screen_resize_normal(); break;
	case 'large': screen_resize_large(); break;
	}

	screen_logo(mode);
	screen_resize_headers();

	// On iOS and Android the content frame height is never correct, fix it.
	// Actually I observed the issue on my old iPad with iOS 9.3.
	if (bw.webkit && bw.ipad && bw.agent.match(/OS 9/)) {
	$('.iframe-wrapper').each(function() {
	var h = $(this).height();
	if (h) {
	$(this).children('iframe').height(h);
	}
	});
	}
	};

	/**
	* Assigns layout-* and touch-mode class to the 'html' element
	*
	* If we're inside an iframe that is small we have to
	* check if the parent window is also small (mobile).
	* We use that e.g. to still display desktop-like popovers in dialogs
	*/
	function screen_resize_html()
	{
	var meta = layout_metadata(),
	html = $(document.documentElement);

	if (html[0].className.match(/layout-([a-z]+)/)) {
	if (RegExp.$1 != meta.mode) {
	html.removeClass('layout-' + RegExp.$1)
	.addClass('layout-' + meta.mode);
	}
	}
	else {
	html.addClass('layout-' + meta.mode);
	}

	if (meta.touch && !html.is('.touch')) {
	html.addClass('touch');
	}
	else if (!meta.touch && html.is('.touch')) {
	html.removeClass('touch');
	}
	};

	function screen_logo(mode)
	{
	var logos = rcmail.env.additional_logos;
	if (logos) {
	// Store default logo path if not already set
	if (!$('#logo').data('src-default')) {
	$('#logo').data('src-default', $('#logo').attr('src'));
	}

	if (mode == 'phone' && color_mode == 'dark' && logos['small-dark']) {
	$('#logo').attr('src', logos['small-dark']);
	}
	else if (mode == 'phone' && logos['small']) {
	$('#logo').attr('src', logos['small']);
	}
	else if (color_mode == 'dark' && logos['dark']) {
	$('#logo').attr('src', logos['dark']);
	}
	else {
	$('#logo').attr('src', $('#logo').data('src-default'));
	}
	}
	}

	/**
	* Sets left and right margin to the header title element to make it
	* properly centered depending on the number of buttons on both sides
	*/
	function screen_resize_headers()
	{
	$('#layout > div > .header').each(function() {
	var title, right = 0, left = 0, padding = 0,
	sizes = {left: 0, right: 0};

	$(this).children(':visible:not(.position-absolute)').each(function() {
	if (!title && $(this).is('.header-title')) {
	title = $(this);
	return;
	}

	sizes[title ? 'right' : 'left'] += this.offsetWidth;
	});

	if (padding + sizes.right >= sizes.left) {
	right = 0;
	left = sizes.right + padding - sizes.left;
	}
	else {
	left = 0;
	right = sizes.left - (padding + sizes.right);
	}

	$(title).css({
	'margin-right': right + 'px',
	'margin-left': left + 'px',
	'padding-right': padding + 'px'
	});
	});
	};

	function screen_resize_phone()
	{
	screen_resize_small_all();
	app_menu(false);
	};

	function screen_resize_small()
	{
	screen_resize_small_all();
	app_menu(true);
	};

	function screen_resize_normal()
	{
	var show;

	if (layout.list.length) {
	show = layout.list.is(env.last_selected) \|\| (!layout.sidebar.is(env.last_selected) && !layout.sidebar.is('.layout-sticky'));
	layout.list[show ? 'removeClass' : 'addClass']('hidden');
	}
	if (layout.sidebar.length) {
	show = !layout.list.length \|\| layout.sidebar.is(env.last_selected) \|\| layout.sidebar.is('.layout-sticky');
	layout.sidebar[show ? 'removeClass' : 'addClass']('hidden');
	}

	layout.content.removeClass('hidden');
	app_menu(true);
	screen_resize_small_none();

	if (layout.list.length) {
	$('.header > ul.menu', layout.list).addClass('popupmenu');
	}
	};

	function screen_resize_large()
	{
	$.each(layout, function(name, item) { item.removeClass('hidden'); });

	screen_resize_small_none();

	if (layout.list) {
	$('.header > ul.menu.popupmenu', layout.list).removeClass('popupmenu');
	}
	};

	function screen_resize_small_all()
	{
	var show, got_content = false;

	if (layout.content.length) {
	show = got_content = layout.content.is(env.last_selected);
	layout.content[show ? 'removeClass' : 'addClass']('hidden');
	$('.header > ul.menu', layout.content).addClass('popupmenu');
	}

	if (layout.list.length) {
	show = !got_content && layout.list.is(env.last_selected);
	layout.list[show ? 'removeClass' : 'addClass']('hidden');
	$('.header > ul.menu', layout.list).addClass('popupmenu');
	}

	if (layout.sidebar.length) {
	show = !got_content && (layout.sidebar.is(env.last_selected) \|\| !layout.list.length);
	layout.sidebar[show ? 'removeClass' : 'addClass']('hidden');
	}

	if (got_content) {
	buttons.back_list.show();
	}
	};

	function screen_resize_small_none()
	{
	buttons.back_list.filter(function() { return $(this).parents('#layout-sidebar').length == 0; }).hide();
	$('ul.menu.popupmenu').removeClass('popupmenu');
	};

	function show_content(unsticky)
	{
	// show sidebar and hide list
	layout.list.addClass('hidden');
	layout.sidebar.addClass('hidden');
	layout.content.removeClass('hidden');

	if (unsticky) {
	layout.sidebar.removeClass('layout-sticky');
	}

	screen_resize_headers();
	env.last_selected = layout.content[0];
	};

	function show_sidebar(sticky)
	{
	// show sidebar and hide list
	layout.list.addClass('hidden');
	layout.sidebar.removeClass('hidden');

	if (sticky) {
	layout.sidebar.addClass('layout-sticky');
	}

	if (mode == 'small' \|\| mode == 'phone') {
	layout.content.addClass('hidden');
	}

	screen_resize_headers();
	env.last_selected = layout.sidebar[0];
	};

	function show_list(scroll)
	{
	if (!layout.list.length && !layout.sidebar.length) {
	history.back();
	}
	else {
	// show list and hide sidebar and content
	layout.sidebar.addClass('hidden').removeClass('layout-sticky');
	layout.list.removeClass('hidden');

	if (mode == 'small' \|\| mode == 'phone') {
	hide_content();
	}

	if (scroll) {
	layout.list.children('.scroller').scrollTop(0);
	}

	env.last_selected = layout.list[0];
	}

	screen_resize_headers();
	};

	function hide_content()
	{
	// show sidebar or list, hide content frame
	env.last_selected = layout.list[0] \|\| layout.sidebar[0];
	screen_resize();

	// reset content frame, so we can load it again
	rcmail.show_contentframe(false);

	// now we have to unselect selected row on the list
	$('[data-list]', layout.list).each(function() {
	var list = $(this).data('list');
	if (rcmail[list]) {
	if (rcmail[list].clear_selection) {
	rcmail[list].clear_selection(); // list widget
	}
	else if (rcmail[list].select) {
	rcmail[list].select(); // treelist widget
	}
	}
	});
	};

	// show menu widget
	function app_menu(show)
	{
	if (show) {
	if (mode == 'phone') {
	$('<div id="menu-overlay" class="popover-overlay">')
	.on('click', function() { app_menu(false); })
	.appendTo('body');

	if (!env.menu_initialized) {
	env.menu_initialized = true;
	$('a', layout.menu).on('click', function(e) { if (mode == 'phone') app_menu(); });
	}

	layout.menu.addClass('popover');
	}

	layout.menu.removeClass('hidden');
	}
	else {
	$('#menu-overlay').remove();
	layout.menu.addClass('hidden').removeClass('popover');
	}
	};

	/**
	* Triggered when a UI message is displayed
	*/
	function message_displayed(p)
	{
	if (p.type == 'loading' && $('.iframe-loader:visible').length) {
	// hide original message object, we don't need two "loaders"
	rcmail.hide_message(p.object);
	return;
	}

	alert_style(p.object, p.type, true);
	$(p.object).attr('role', 'alert');
	};

	/**
	* Applies some styling and icon to an alert object
	*/
	function alert_style(object, type, wrap)
	{
	var tmp, classes = 'ui alert',
	addicon = !$(object).is('.noicon'),
	map = {
	information: 'alert-info',
	notice: 'alert-info',
	confirmation: 'alert-success',
	warning: 'alert-warning',
	error: 'alert-danger',
	loading: 'alert-info loading',
	uploading: 'alert-info loading',
	vcardattachment: 'alert-info' // vcard_attachments plugin
	};

	// we need the content to be non-text node for best alignment
	if (wrap && addicon && !$(object).is('.aligned-buttons')) {
	$(object).html($('<span>').html($(object).html()));
	}

	// Type can be e.g. 'notice chat'
	type = type.split(' ')[0];

	if (tmp = map[type]) {
	classes += ' ' + tmp;
	if (addicon) {
	$('<i>').attr('class', 'icon').prependTo(object);
	}
	}

	$(object).addClass(classes);
	};

	/**
	* Set UI dialogs size/style depending on screen size
	*/
	function dialog_open(dialog)
	{
	var me = $(dialog.uiDialog),
	width = me.width(),
	height = me.height(),
	maxWidth = $(window).width(),
	maxHeight = $(window).height();

	if (maxWidth <= 480) {
	me.css({width: '100%', height: '100%'});
	}
	else {
	if (height > maxHeight) {
	me.css('height', '100%');
	}
	if (width > maxWidth) {
	me.css('width', '100%');
	}
	}

	// Close all popovers
	$(document).click();

	// Display loader when the dialog has an iframe
	iframe_loader($('div.popup > iframe', me));

	// TODO: style buttons/forms
	bootstrap_style(dialog.uiDialog);
	};

	/**
	* Initializes searchbar widget
	*/
	function searchbar_init(bar)
	{
	var unread_button = $(),
	options_button = $('a.button.options', bar),
	input = $('input:not([type=hidden])', bar),
	placeholder = input.attr('placeholder'),
	form = $('form', bar),
	is_search_pending = function() {
	if (input.val()) {
	return true;
	}

	if (rcmail.task == 'mail' && $('#s_interval').val()) {
	return true;
	}

	if (rcmail.gui_objects.search_filter && $(rcmail.gui_objects.search_filter).val() != 'ALL') {
	return true;
	}

	if (rcmail.gui_objects.foldersfilter && $(rcmail.gui_objects.foldersfilter).val() != '---') {
	return true;
	}
	},
	close_func = function() {
	if ($(bar).is('.open')) {
	options_button.click();
	}
	},
	update_func = function() {
	$(bar)[is_search_pending() ? 'addClass' : 'removeClass']('active');
	unread_button[rcmail.gui_objects.search_filter && $(rcmail.gui_objects.search_filter).val() == 'UNSEEN' ? 'addClass' : 'removeClass']('selected');
	};

	// Add Unread filter button
	if (input.is('#mailsearchform')) {
	unread_button = $('<a>')
	.attr({'class': 'button unread', href: '#', role: 'button', title: rcmail.gettext('showunread')})
	.on('click', function(e) {
	$(rcmail.gui_objects.search_filter).val($(e.target).is('.selected') ? 'ALL' : 'UNSEEN');
	rcmail.command('search');
	})
	.insertBefore(options_button);
	}

	options_button.on('click', function(e) {
	var id = $(this).data('target'),
	options = $('#' + id),
	open = $(bar).is('.open');

	if (options.length) {
	if (!open) {
	if (ref[id]) {
	ref[id](options.get(0), this, e);
	}
	else if (typeof window[id] == 'function') {
	window[id](options.get(0), this, e);
	}
	}

	options.next()[open ? 'show' : 'hide']();
	options.toggleClass('hidden');
	$('.floating-action-buttons').toggleClass('hidden');
	$(bar).toggleClass('open');

	$('button.search', options).off('click.search').on('click.search', function() {
	options_button.click();
	update_func();
	});
	}
	});

	input.on('input change', update_func)
	.on('focus blur', function(e) { input.attr('placeholder', e.type == 'blur' ? placeholder : ''); });

	// Search reset action
	$('a.reset', bar).on('click', function(e) {
	// for treelist widget's search setting val and keyup.treelist is needed
	// in normal search form reset-search command will do the trick
	input.val('').change().trigger('keyup.treelist', {keyCode: 27});
	if ($(bar).is('.open')) {
	options_button.click();
	}

	// Reset filter
	if (rcmail.gui_objects.search_filter) {
	$(rcmail.gui_objects.search_filter).val('ALL');
	}

	if (rcmail.gui_objects.foldersfilter) {
	$(rcmail.gui_objects.foldersfilter).val('---').change();
	rcmail.folder_filter('---');
	}

	update_func();
	});

	rcmail.addEventListener('init', update_func)
	.addEventListener('responsebeforesearch', update_func)
	.addEventListener('beforelist', close_func)
	.addEventListener('afterlist', update_func)
	.addEventListener('beforesearch', close_func);
	};

	/**
	* Converts toolbar menu into popup-menu for small screens
	*/
	function toolbar_init()
	{
	if (env.got_smart_toolbar) {
	return;
	}

	env.got_smart_toolbar = true;

	var list_mark, items = [],
	list_items = [],
	meta = layout_metadata(),
	button_func = function(button, items, cloned) {
	var item = $('<li role="menuitem">');

	button = cloned ? create_cloned_button($(button), true, 'hidden-big hidden-large') : $(button).detach();

	// Remove empty text nodes that break alignment of text of the menu item
	button.contents().filter(function() { if (this.nodeType == 3 && this.nodeValue.trim().length == 0) $(this).remove(); });

	if (button.is('.spacer')) {
	item.addClass('spacer');
	}
	else {
	item.append(button);
	}

	items.push(item);
	};

	// convert content toolbar to a popup list
	layout.content.find('.header > .menu').each(function() {
	var toolbar = $(this);

	toolbar.children().each(function() { button_func(this, items); });
	toolbar.remove();
	});

	// convert list toolbar to a popup list
	layout.list.find('.header > .menu').each(function() {
	var toolbar = $(this);

	list_mark = toolbar.next();

	toolbar.children().each(function() {
	if (meta.mode != 'large') {
	// TODO: Would be better to set this automatically on submenu display
	// i.e. in show/shown event (see popup_init()), if possible
	$(this).data('popup-pos', 'right');
	}

	// add items to the content menu too
	button_func(this, items, true);
	button_func(this, list_items);
	});

	toolbar.remove();
	});

	// special elements to clone and add to the toolbar (mobile only)
	$('ul[data-menu="toolbar-small"] > li > a').each(function() {
	var button = $(this).clone();

	button.attr('id', this.id + '_clone');

	// TODO: rcmail.register_button()

	items.push($('<li role="menuitem">').addClass('hidden-big').append(button));
	});

	// append the new list toolbar and menu button
	if (list_items.length) {
	var container = layout.list.children('.header'),
	menu_attrs = {'class': 'menu toolbar popupmenu listing iconized', id: 'toolbar-list-menu'},
	menu_button = $('<a class="button icon toolbar-list-button" href="#list-menu">')
	.attr({'data-popup': 'toolbar-list-menu'}),
	// TODO: copy original toolbar attributes (class, role, aria-*)
	toolbar = $('<ul>').attr(menu_attrs).data('popup-parent', container).append(list_items);

	if (list_mark.length) {
	toolbar.insertBefore(list_mark);
	}
	else {
	container.append(toolbar);
	}
	container.append(menu_button);
	}

	// append the new toolbar and menu button
	if (items.length) {
	var container = layout.content.children('.header'),
	menu_attrs = {'class': 'menu toolbar popupmenu listing iconized', id: 'toolbar-menu'},
	menu_button = $('<a class="button icon toolbar-menu-button" href="#menu">')
	.attr({'data-popup': 'toolbar-menu'});

	container
	// TODO: copy original toolbar attributes (class, role, aria-*)
	.append($('<ul>').attr(menu_attrs).data('popup-parent', container).append(items))
	.append(menu_button);

	// bind toolbar menu with the menu button in the list header
	layout.list.find('a.toolbar-menu-button').click(function(e) {
	e.stopPropagation();
	menu_button.click();
	});
	}
	};

	/**
	* Initialize a popup for specified button element
	*/
	function popup_init(item, win)
	{
	// On mobile we display the menu from the frame in the parent window
	if (is_framed && is_mobile()) {
	return parent.UI.popup_init(item, win \|\| window);
	}

	if (!win) win = window;
	var level,
	popup_id = $(item).data('popup'),
	popup = $(win.$('#' + popup_id).get(0)), // a "hack" to support elements in frames
	popup_orig = popup,
	title = $(item).attr('title'),
	content_element = function() {
	// On mobile we display a menu from the frame in the parent window
	// To make menu actions working we have to clone the menu
	// and pass click events to it...
	if (win != window) {
	popup = popup_orig.clone(true, true);
	popup.attr('id', popup_id + '-clone')
	.appendTo(document.body)
	.find('li > a').attr('onclick', '').off('click').on('click', function(e) {
	if (!$(this).is('.disabled')) {
	$(item).popover('hide');
	win.$('#' + $(this).attr('id')).click();
	}

	return false;
	});
	}

	return popup.get(0);
	};

	$(item).attr({
	'aria-haspopup': 'true',
	'aria-expanded': 'false',
	'aria-owns': popup_id,
	})
	.popover({
	content: content_element,
	trigger: $(item).data('popup-trigger') \|\| 'click',
	placement: $(item).data('popup-pos') \|\| 'bottom',
	animation: true,
	boundary: 'window', // fix for https://github.com/twbs/bootstrap/issues/25428
	html: true
	})
	.on('show.bs.popover', function(event) {
	var init_func = popup.data('popup-init');

	if (popup_id && menus[popup_id]) {
	menus[popup_id].transitioning = true;
	}

	if (init_func && ref[init_func]) {
	ref[init_func](popup.get(0), item, event);
	}
	else if (init_func && win[init_func]) {
	win[init_func](popup.get(0), item, event);
	}

	level = $('div.popover:visible').length + 1;

	popup.removeClass('hidden').attr('aria-hidden', false)
	// Stop propagation on menu items that have popups
	// to make a click on them not hide their parent menu(s)
	.find('[aria-haspopup="true"]')
	.data('level', level + 1)
	.off('click.popup')
	.on('click.popup', function(e) { e.stopPropagation(); });

	if (!is_mobile()) {
	// Set popup height so it is less than the window height
	popup.css('max-height', Math.min(36 * 15 - 1, $(window).height() - 30));
	}
	})
	.on('shown.bs.popover', function(event) {
	var mobile = is_mobile(),
	popover = $('#' + $(item).attr('aria-describedby'));

	level = $(item).data('level') \|\| 1;

	// Set popup Back/Close title
	if (mobile) {
	var label = level > 1 ? 'back' : 'close',
	title = rcmail.gettext(label),
	class_name = 'button icon ' + (label == 'back' ? 'back' : 'cancel');

	$('.popover-header', popover).empty()
	.append($('<a>').attr('class', class_name).text(title)
	.on('click', function(e) {
	$(item).popover('hide');
	if (level > 1) {
	e.stopPropagation();
	}
	})
	.on('mousedown', function(e) {
	// stop propagation to i.e. do not close jQuery-UI dialogs below
	e.stopPropagation();
	})
	);
	}

	// Hide other menus on the same level
	$.each(menus, function(id, prop) {
	if ($(prop.target).data('level') == level && id != popup_id) {
	menu_hide(id);
	}
	});

	// On keyboard event focus the first (active) entry and enable keyboard navigation
	if ($(item).data('event') == 'key') {
	popover.off('keydown.popup').on('keydown.popup', 'a.active', function(e) {
	var entry, node, mode = 'next';

	switch (e.which) {
	case 27: // ESC
	case 9: // TAB
	$(item).popover('toggle').focus();
	return false;

	case 38: // ARROW-UP
	case 63232:
	mode = 'previous';
	case 40: // ARROW-DOWN
	case 63233:
	entry = e.target.parentNode;
	while (entry = entry[mode + 'Sibling']) {
	if (node = $(entry).children('.active')[0]) {
	node.focus();
	break;
	}
	}
	return false; // prevents from scrolling the whole page
	}
	});

	popover.find('a.active').first().focus();
	}

	if (popup_id && menus[popup_id]) {
	menus[popup_id].transitioning = false;
	}

	// add overlay element for phone layout
	if (mobile && !$('.popover-overlay').length) {
	$('<div>').attr('class', 'popover-overlay')
	.appendTo('body')
	.click(function() { $(this).remove(); });
	}

	$('.popover-body', popover).addClass('webkit-scroller');
	})
	.on('hide.bs.popover', function() {
	if (level == 1) {
	$('.popover-overlay').remove();
	}

	if (popup_id && menus[popup_id] && popup.is(':visible')) {
	menus[popup_id].transitioning = true;
	}

	// Note: We do not use hidden.bs.popover event because it is not always executed (#8602)
	setTimeout(function () {
	if (/-clone$/.test(popup.attr('id'))) {
	popup.remove();
	}
	else {
	popup.attr('aria-hidden', true)
	// Some menus aren't being hidden, force that
	.addClass('hidden')
	// Bootstrap will detach the popup element from
	// the DOM (https://github.com/twbs/bootstrap/issues/20219)
	// making our menus to not update buttons state.
	// Work around this by attaching it back to the DOM tree.
	.appendTo(popup.data('popup-parent') \|\| document.body);
	}

	// close orphaned popovers, for some reason there are sometimes such dummy elements left
	$('.popover-body:empty').each(function() { $(this).parent().remove(); });

	if (popup_id && menus[popup_id]) {
	delete menus[popup_id];
	}
	}, 200);
	})
	// Because Bootstrap does not provide originalEvent in show/shown events
	// we have to handle that by our own using click and keydown handlers
	.on('click', function() {
	$(this).data('event', 'mouse');
	})
	.on('keydown', function(e) {
	if (e.originalEvent) {
	switch (e.originalEvent.which) {
	case 13:
	case 32:
	// Open the popup on ENTER or SPACE
	e.preventDefault();
	$(this).data('event', 'key').popover('toggle');
	break;
	case 27:
	// Close the popup on ESC key
	$(this).popover('hide');
	break;
	}
	}
	});

	// re-add title attribute removed by bootstrap popover
	if (title) {
	$(item).attr('title', title);
	}

	if (is_mobile() \|\| !popup.is('.toolbar')) {
	popup.attr('aria-hidden', 'true');
	}

	popup.data('button', item);

	// stop propagation to e.g. do not hide the popup when
	// clicking inside on form elements
	if (popup.data('editable')) {
	popup.on('click mousedown', function(e) { e.stopPropagation(); });
	}
	};

	/**
	* Closes all popups (for use as event handler)
	*/
	function popups_close(e)
	{
	// Ignore some of propagated click events (see pretty_select())
	if (popups_close_lock && popups_close_lock > (new Date().getTime() - 250)) {
	return;
	}

	$('.popover.show').each(function() {
	var popup = $('.popover-body', this),
	button = popup.children().first().data('button');

	if (button && e.target != button && !$(button).find(e.target).length && typeof button !== 'string') {
	$(button).popover('hide');
	}

	if (!button) {
	$(this).remove();
	}
	});
	};

	/**
	* Handler for menu-open and menu-close events
	*/
	function menu_toggle(p)
	{
	if (!p \|\| !p.name \|\| (p.props && p.props.skinable === false)) {
	return;
	}

	if (is_framed && is_mobile()) {
	if (!p.win) {
	p.win = window;
	}
	return parent.UI.menu_toggle(p);
	}

	if (p.name == 'messagelistmenu') {
	menu_messagelist(p);
	}
	else if (p.event == 'menu-open') {
	var fn, pos,
	content = $('ul', p.obj).first(),
	target = p.props && p.props.link ? p.props.link : p.originalEvent.target;

	// Sanity check, make sure we have some content to show
	if (!content.length) {
	return;
	}

	if ($(target).is('span')) {
	target = $(target).parents('a,li')[0];
	}

	if (p.name.match(/^drag/)) {
	// create a fake element to position drag menu on the cursor position
	pos = rcube_event.get_mouse_pos(p.originalEvent);
	target = $('<a>').css({
	position: 'absolute',
	left: pos.x,
	top: pos.y,
	height: '1px',
	width: '1px',
	visibility: 'hidden'
	})
	.appendTo(document.body).get(0);
	}

	pos = $(target).data('popup-pos') \|\| 'right';

	if (p.name == 'folder-selector') {
	content.addClass('listing folderlist');
	}
	else if (p.name == 'addressbook-selector' \|\| p.name == 'contactgroup-selector') {
	content.addClass('listing contactlist');
	}
	else if (content.hasClass('menu')) {
	content.addClass('listing');
	}

	if (p.name == 'pagejump-selector') {
	content.addClass('simplelist');
	p.obj.addClass('simplelist');
	pos = 'top';
	}

	// There can be only one menu of the same type
	if (menus[p.name]) {
	menu_hide(p.name, p.originalEvent);
	}

	// Popover menus use animation. Sometimes the same menu is
	// immediately hidden and shown (e.g. folder-selector for copy and move action)
	// we have to wait until the previous menu hides before we can open it again
	fn = function() {
	if (menus[p.name] && menus[p.name].transitioning) {
	return setTimeout(fn, 50);
	}

	if (!$(target).data('popup')) {
	$(target).data({
	event: rcube_event.is_keyboard(p.originalEvent) ? 'key' : 'mouse',
	popup: p.name,
	'popup-pos': pos,
	'popup-trigger': 'manual'
	});
	popup_init(target, p.win);
	}

	menus[p.name] = {target: target};

	// setTimeout fixes Shift + drag'n'drop menu in Chrome (#8107)
	setTimeout(function() { $(target).popover('show'); }, 1);
	}

	fn();
	}
	else {
	menu_hide(p.name, p.originalEvent);
	}

	// Stop propagation so multi-level menus work properly
	p.originalEvent.stopPropagation();
	};

	/**
	* Close menu by name
	*/
	function menu_hide(name, event)
	{
	var target = menu_target(name);

	if (name.match(/^drag/)) {
	$(target).popover('dispose').remove();
	}
	else {
	$(target).popover('hide');

	// In phone mode close all menus when forwardmenu is requested to be closed
	// FIXME: This is a hack, we need some generic solution.
	if (name == 'forwardmenu') {
	popups_close(event);
	}
	}
	};

	/**
	* Destroys menu by name
	*
	* This is required when you replace the menu content element
	*/
	function menu_destroy(name)
	{
	$('[aria-owns=' + name + ']').popover('dispose').data('popup', null);
	};

	/**
	* Get menu target by name
	*/
	function menu_target(name)
	{
	var target;

	if (menus[name]) {
	target = menus[name].target;
	}
	else {
	target = $('#' + name).data('button');

	if (!target) {
	// catch cases as 'forwardmenu' where menu suffix has no hyphen
	// or try with -menu suffix if it's not in the menu name already
	if (name.match(/(?!-)menu$/)) {
	name = name.substr(0, name.length - 4);
	}

	target = $('#' + name + '-menu').data('button');
	}
	}

	return target;
	};

	/**
	* Messages list options dialog
	*/
	function menu_messagelist(p)
	{
	var content = $('#listoptions-menu'),
	width = content.width() + 25,
	dialog = content.clone(true);

	// set form values
	$('select[name="sort_col"]', dialog).val(rcmail.env.sort_col \|\| '');
	$('select[name="sort_ord"]', dialog).val(rcmail.env.sort_order \|\| 'ASC');
	$('select[name="mode"]', dialog).val(rcmail.env.threading ? 'threads' : 'list');

	// Fix id/for attributes
	$('select', dialog).each(function() { this.id = this.id + '-clone'; });
	$('label', dialog).each(function() { $(this).attr('for', $(this).attr('for') + '-clone'); });

	var save_func = function(e) {
	if (rcube_event.is_keyboard(e.originalEvent)) {
	$('#listmenulink').focus();
	}

	var col = $('select[name="sort_col"]', dialog).val(),
	ord = $('select[name="sort_ord"]', dialog).val(),
	mode = $('select[name="mode"]', dialog).val();

	rcmail.set_list_options([], col, ord, mode == 'threads' ? 1 : 0);
	return true;
	};

	dialog = rcmail.simple_dialog(dialog, 'listoptionstitle', save_func, {
	closeOnEscape: true,
	minWidth: 400
	});
	};

	/**
	* About dialog
	*/
	function about_dialog(elem)
	{
	var support_url, support_func, support_button = false,
	dialog = $('<iframe>').attr({id: 'aboutframe', src: rcmail.url('settings/about', {_framed: 1})}),
	support_link = $('#supportlink');

	if (support_link.length && (support_url = support_link.attr('href'))) {
	support_button = support_link.text();
	support_func = function(e) { support_url.indexOf('mailto:') < 0 ? window.open(support_url) : location.href = support_url; };
	}

	rcmail.simple_dialog(dialog, $(elem).text(), support_func, {
	button: support_button,
	button_class: 'help',
	cancel_button: 'close',
	height: 400
	});
	};

	/**
	* Show/hide more mail headers (envelope)
	*/
	function headers_show(toggle)
	{
	var key = 'mail.show.envelope',
	pref = get_pref(key),
	show = toggle ? !pref : pref,
	mode = show ? 'summary' : 'details',
	headers = $('div.header-content');

	$('div.header-links').find('a.headers-details,a.headers-summary')
	.removeClass().addClass('headers-' + mode).text(rcmail.gettext(mode));

	headers[show ? 'addClass' : 'removeClass']('details-view');

	if (toggle) {
	// save new pref
	set_pref(key, show);
	}
	};

	/**
	* Mail headers dialog
	*/
	function headers_dialog()
	{
	var props = {_uid: rcmail.env.uid, _mbox: rcmail.env.mailbox, _framed: 1},
	dialog = $('<iframe>').attr({id: 'headersframe', src: rcmail.url('headers', props)});

	rcmail.simple_dialog(dialog, 'arialabelmessageheaders', null, {
	cancel_button: 'close',
	height: 400
	});
	};

	/**
	* Attachment properties dialog
	*/
	function props_dialog()
	{
	var dialog = $('#properties-menu').clone();

	rcmail.simple_dialog(dialog, 'properties', null, {
	cancel_button: 'close',
	height: 400
	});
	};

	/**
	* Mail import dialog
	*/
	function import_dialog()
	{
	if (!rcmail.commands['import-messages']) {
	return;
	}

	var content = $('#uploadform'),
	dialog = content.clone(true);

	var save_func = function(e) {
	return rcmail.command('import-messages', $(dialog.find('form')[0]));
	};

	rcmail.simple_dialog(dialog, 'importmessages', save_func, {
	button: 'import',
	closeOnEscape: true,
	minWidth: 400
	});
	};

	/**
	* Search options menu popup
	*/
	function searchmenu(obj)
	{
	var n, all = '*',
	list = $('input[name="s_mods[]"]', obj),
	scope_select = $('#s_scope', obj),
	interval_select = $('#s_interval', obj),
	mbox = rcmail.env.mailbox,
	mods = rcmail.env.search_mods,
	scope = rcmail.env.search_scope \|\| 'base';

	if (!$(obj).data('initialized')) {
	$(obj).data('initialized', true);
	if (list.length) {
	list.on('change', function() { set_searchmod(obj, this); });

	rcmail.addEventListener('beforesearch', function() {
	rcmail.env.search_scope = scope_select.val();
	rcmail.env.search_interval = interval_select.val();
	});
	}

	$(obj).find('.proplist > li > a.dropdown').on('click', function() {
	var list = $(this).next()
	list[list.is('.d-none') ? 'removeClass' : 'addClass']('d-none');
	});
	}

	scope_select.val(scope);

	if (mods) {
	if (rcmail.env.task == 'mail') {
	mods = mods[mbox] \|\| mods['*'];
	all = 'text';
	}

	if (mods[all]) {
	list.map(function() {
	this.checked = true;
	this.disabled = this.value != all;
	});
	}
	else {
	list.prop('disabled', false).prop('checked', false);
	for (n in mods) {
	list.filter('[value="' + n + '"]').prop('checked', true);
	}
	}
	}

	set_searchmod_masters(obj);
	};

	/**
	* Handler for a search option state update
	*/
	function set_searchmod(menu, elem)
	{
	var all, m, masters = {},
	list = $('input[name="s_mods[]"]', menu),
	task = rcmail.env.task,
	mods = rcmail.env.search_mods \|\| {},
	mbox = rcmail.env.mailbox;

	if (task == 'mail') {
	if (!mods[mbox]) {
	mods[mbox] = rcube_clone_object(mods['*']);
	}
	m = mods[mbox];
	all = 'text';
	masters = {
	sender: ['from', 'replyto', 'followupto'],
	recipient: ['to', 'cc', 'bcc']
	};
	}
	else {
	// addressbook
	m = mods;
	all = '*';
	}

	if (!elem.checked) {
	delete(m[elem.value]);
	}
	else {
	m[elem.value] = 1;
	}

	// mark all fields
	if (elem.value == all) {
	list.not(elem).each(function() {
	this.checked = true;

	if (elem.checked) {
	this.disabled = true;
	delete m[this.value];
	}
	else {
	this.disabled = false;
	if (!(this.value in masters)) {
	m[this.value] = 1;
	}
	}
	});
	}
	// Handle clicks on Sender/Recipient elements
	else if (elem.value in masters) {
	delete m[elem.value];

	list.filter(function() { return $.inArray(this.value, masters[elem.value]) != -1; }).each(function() {
	if (elem.checked) {
	this.checked = true;
	m[this.value] = 1;
	}
	else {
	this.checked = false;
	delete m[this.value];
	}
	});
	}
	else if (masters.sender) {
	set_searchmod_masters(menu);
	}

	rcmail.set_searchmods(m);
	};

	/*
	* Set state of the Sender/Recipient checkbox depending on whether any of the sub-items are checked
	*/
	function set_searchmod_masters(obj)
	{
	$(obj).find('.proplist > li.with-sublist').each(function() {
	$(this).find(':not(.proplist) input')[0].checked = $(this).children('.proplist').find('input:checked').length > 0;
	});
	}

	/**
	* Spellcheck languages list
	*/
	function spellmenu(obj)
	{
	var i, link, li, list = [],
	lang = rcmail.spellcheck_lang(),
	ul = $('ul', obj);

	if (!ul.length) {
	ul = $('<ul class="selectable listing iconized" role="menu">');

	for (i in rcmail.env.spell_langs) {
	li = $('<li role="menuitem">');
	link = $('<a href="#'+ i +'" tabindex="0"></a>')
	.text(rcmail.env.spell_langs[i])
	.addClass('active').data('lang', i)
	.on('click keypress', function(e) {
	if (e.type != 'keypress' \|\| rcube_event.get_keycode(e) == 13) {
	rcmail.spellcheck_lang_set($(this).data('lang'));
	rcmail.hide_menu('spell-menu', e);
	return false;
	}
	});

	link.appendTo(li);
	list.push(li);
	}

	ul.append(list).appendTo(obj);
	}

	// select current language
	$('li', ul).each(function() {
	var el = $('a', this);
	if (el.data('lang') == lang) {
	el.addClass('selected').attr('aria-selected', 'true');
	}
	else if (el.hasClass('selected')) {
	el.removeClass('selected').removeAttr('aria-selected');
	}
	});
	};

	/**
	* Add/remove item to/from compose options status bar
	*/
	function compose_status(id, status)
	{
	var bar = $('#composestatusbar'), ico = bar.find('a.button.icon.' + id);

	if (!status) {
	ico.remove();
	}
	else if (!ico.length) {
	$('<a>').attr('class', 'button icon ' + id)
	.on('click', function() { show_sidebar(); })
	.appendTo(bar);
	}
	};

	/**
	* Attachment menu
	*/
	function attachmentmenu(obj, button, event)
	{
	var id = $(button).parent().attr('id').replace(/^attach/, '');

	$.each(['open', 'download', 'rename'], function() {
	var action = this;
	$('#attachmenu' + action, obj).off('click').attr('onclick', '').click(function(e) {
	return rcmail.command(action + '-attachment', id, this, e.originalEvent);
	});
	});

	// call menu-open so core can set state of menu commands
	return rcmail.command('menu-open', {menu: 'attachmentmenu', id: id}, obj, event);
	};

	/**
	* Appends drop-icon to attachments list item (to invoke attachment menu)
	*/
	function attachmentmenu_append(item)
	{
	item = $(item);

	if (!item.is('.no-menu') && !item.children('.dropdown').length) {
	var label = rcmail.gettext('options'),
	fname = item.find('a.filename');

	var button = $('<a>').attr({
	href: '#',
	tabindex: fname.attr('tabindex') \|\| 0,
	title: label,
	'class': 'button icon dropdown skip-content'
	})
	.on('click', function(e) {
	return attachmentmenu($('#attachmentmenu'), button, e);
	})
	.append($('<span>').attr('class', 'inner').text(label));

	if (fname.length) {
	button.insertAfter(fname);
	}
	else {
	button.appendTo(item);
	}
	}
	};

	/**
	* Mailto menu
	*/
	function mailtomenu(obj, button, event, onclick)
	{
	var mailto = $(button).attr('href').replace(/^mailto:/, '');

	if (mailto.indexOf('@') < 0) {
	return true; // let the browser handle this
	}

	// disable all menu actions
	obj.find('a').off('click').removeClass('active');

	if (rcmail.env.has_writeable_addressbook) {
	$('.addressbook', obj).addClass('active')
	.on('click', function(e) {
	var i, contact = mailto,
	txt = $(button).filter('.rcmContactAddress').text();

	contact = contact.split('?')[0].split(',')[0].replace(/(^<\|>$)/g, '');

	if (txt) {
	txt = txt.replace('<' + contact + '>', '');
	contact = '"' + txt.trim() + '" <' + contact + '>';
	}

	return rcmail.command('add-contact', contact, this, e.originalEvent);
	});
	}

	$('.compose', obj).addClass('active').on('click', function(e) {
	// Execute the original onclick handler to support mailto URL arguments (#6751)
	if (onclick) {
	button.onclick = onclick;
	// use the second argument to tell our handler to not display the menu again
	$(button).trigger('click', [true]);
	button.onclick = null;
	}
	else {
	rcmail.command('compose', mailto, this, e.originalEvent);
	}

	return false; // for Chrome
	});

	return rcmail.command('menu-open', {menu: 'mailto-menu', link: button}, button, event.originalEvent);
	};

	/**
	* Appends popup menu to mailto links
	*/
	function mailtomenu_append(item)
	{
	// Remember the original onclick handler and display the menu instead
	var onclick = item.onclick;
	item.onclick = null;
	$(item).on('click', function(e, menu) {
	return menu \|\| mailtomenu($('#mailto-menu'), item, e, onclick);
	});
	};

	/**
	* Headers menu in mail compose
	*/
	function headersmenu(obj, button, event)
	{
	$('li > a', obj).each(function() {
	var link = $(this), target = '#compose_' + link.data('target');

	link[$(target).is(':visible') ? 'removeClass' : 'addClass']('active')
	.off().on('click', function() {
	$(target).removeClass('hidden').find('.recipient-input input').focus();
	link.removeClass('active');
	rcmail.set_menu_buttons();
	});
	});
	};

	/**
	* Reset/hide compose message recipient input
	*/
	function header_reset(id)
	{
	$('#' + id).val('').change()
	// jump to the next input
	.closest('.form-group').nextAll(':not(.hidden)').first().find('input').focus();

	$('a[data-target=' + id.replace(/^_/, '') + ']').addClass('active');
	rcmail.set_menu_buttons();
	};

	/**
	* Recipient (contact) selector
	*/
	function recipient_selector(field, opts)
	{
	if (!opts) opts = {};

	var title = opts.title \|\| 'insertcontact',
	dialog = $('#recipient-dialog'),
	parent = dialog.parent(),
	close_func = function() {
	if (dialog.is(':visible')) {
	rcmail.env.recipient_dialog.dialog('close');
	}
	},
	insert_func = function() {
	if (opts.action) {
	opts.action();
	close_func();
	return;
	}

	rcmail.command('add-recipient');
	};

	if (!rcmail.env.recipient_selector_initialized) {
	rcmail.addEventListener('add-recipient', close_func);
	rcmail.env.recipient_selector_initialized = true;
	}

	if (field) {
	rcmail.env.focused_field = '#_' + field;
	}

	rcmail.contact_list.clear_selection();
	rcmail.contact_list.multiselect = 'multiselect' in opts ? opts.multiselect : true;

	rcmail.env.recipient_dialog = rcmail.simple_dialog(dialog, title, insert_func, {
	button: rcmail.gettext(opts.button \|\| 'insert'),
	button_class: opts.button_class \|\| 'insert recipient',
	height: 600,
	classes: {
	'ui-dialog-content': 'p-0' // remove padding on dialog content
	},
	open: function() {
	// Don't want focus in the search field, we focus first contacts source record instead
	$('#directorylist a').first().focus();
	},
	close: function() {
	dialog.appendTo(parent);
	$(this).remove();
	$(opts.focus \|\| rcmail.env.focused_field).focus();
	}
	});
	};

	/**
	* Create/Update quota widget (setquota event handler)
	*/
	function update_quota(p)
	{
	var element = $('#quotadisplay'),
	bar = element.find('.bar'),
	value = p.total ? p.percent : 0;

	if (!bar.length) {
	bar = $('<span class="bar"><span class="value"></span></span>').appendTo(element);
	}

	if (value > 0 && value < 10) {
	value = 10; // smaller values look not so nice
	}

	bar.find('.value').css('width', value + '%')[value >= 90 ? 'addClass' : 'removeClass']('warning');
	// set title and reset tooltip's data (needed in case of empty title)
	element.attr({'data-original-title': '', title: element.find('.count').attr('title')});

	if (p.table) {
	element.css('cursor', 'pointer').data('popup-pos', 'top')
	.off('click').on('click', function(e) {
	rcmail.simple_dialog(p.table, 'quota', null, {cancel_button: 'close'});
	});
	}
	else {
	element.tooltip('dispose').tooltip({trigger: is_mobile() ? 'click' : 'hover'});
	}
	};

	/**
	* Replaces recipient input with content-editable element that uses "recipient boxes"
	*/
	function recipient_input(obj)
	{
	var list, input, selection = '',
	apply_func = function() {
	// update the original input
	$(obj).val(list.text() + input.val());
	},
	insert_recipient = function(name, email, replace) {
	var recipient = $('<li class="recipient">'),
	name_element = $('<span class="name">').html(recipient_input_name(name \|\| email))
	.on('dblclick', function(e) { recipient_input_edit_dialog(e, insert_recipient); }),
	email_element = $('<span class="email">'),
	// TODO: should the 'close' link have tabindex?
	link = $('<a>').attr({'class': 'button icon remove'})
	.click(function() {
	recipient.remove();
	apply_func();
	input.focus();
	return false;
	});

	if (name) {
	email = ' <' + email + '>';
	}

	email_element.text((name ? email : '') + ',');
	recipient.attr('title', name ? (name + email) : null)
	.append([name_element, email_element, link])

	if (replace)
	replace.replaceWith(recipient);
	else
	recipient.insertBefore(input.parent());

	apply_func();
	},
	update_func = function(text) {
	var result;

	text = (text \|\| input.val()).replace(/[,;\s]+$/, '');
	result = recipient_input_parser(text);

	$.each(result.recipients, function() {
	insert_recipient(this.name, this.email);
	});

	input.val(result.text);
	apply_func();

	return result.recipients.length > 0;
	},
	parse_func = function(e, ac, trigger) {
	var last, paste, value = this.value;

	// #8098: ignore changes when autocomplete_insert is not triggered
	if (trigger === false) {
	return;
	}

	// On paste the text is not yet in the input we have to use clipboard.
	// Also because on paste new-line characters are replaced by spaces (#6460)
	if (e.type == 'paste') {
	// pasted text
	paste = (e.originalEvent.clipboardData \|\| window.clipboardData).getData('text') \|\| '';
	// insert pasted text in place of the selection (or just cursor position)
	value = value.substring(0, this.selectionStart) + paste + value.substring(this.selectionEnd);
	e.preventDefault();
	}
	// #7231: When clicking on autocompletion list a change event
	// is fired twice. We have to remove last recipient box if it is
	// the same recipient (with incomplete email address).
	// FIXME: Anyone with a better solution?
	else if (ac) {
	last = list.find('li.recipient').last();
	if (last.length && this.value.indexOf(last.text().replace(/[ ,]+$/, '')) > -1) {
	last.remove();
	}
	}

	update_func(value);
	},
	keydown_func = function(e) {
	// On Backspace remove the last recipient
	if (e.keyCode == 8 && !input.val().length) {
	list.children('li.recipient').last().remove();
	apply_func();
	return false;
	}
	// Here we add a recipient box when the separator (,;\s) or Enter was pressed,
	else if (e.key == ' ' \|\| e.key == ',' \|\| e.key == ';' \|\| (e.key == 'Enter' && !rcmail.ksearch_visible())) {
	if (update_func()) {
	return false;
	}
	}
	};

	// Create the input element and "editable" area
	input = $('<input>').attr({type: 'text', tabindex: $(obj).attr('tabindex')})
	.on('paste change', parse_func)
	.on('keydown', keydown_func)
	.on('blur', function() { list.removeClass('focus'); })
	.on('focus mousedown', function() { list.addClass('focus'); });

	list = $('<ul>').addClass('form-control recipient-input ac-input rounded-left')
	.append($('<li class="input">').append(input))
	// "selection" hack to allow text selection in the recipient box or multiple boxes (#7129)
	.on('mouseup', function () { selection = window.getSelection().toString(); })
	.on('click', function() { if (!selection.length) input.focus(); })
	.sortable({
	appendTo: document.body,
	items: "> .recipient",
	connectWith: '.recipient-input',
	receive: function(event, ui) {
	var recipient = list.text();
	list.find('.recipient').remove();
	update_func(recipient);
	if (ui.sender) {
	ui.sender.find('input').change();
	}
	}
	});

	// Hide the original input/textarea
	// Note: we do not remove the original element, and we do not use
	// display: none, because we want to handle onfocus event
	// Note: tabindex:-1 to make Shift+TAB working on these widgets
	$(obj).css({position: 'absolute', opacity: 0, left: '-5000px', width: '10px'})
	.attr('tabindex', -1)
	.after(list)
	// some core code sometimes focuses or changes the original node
	// in such cases we want to parse its value and apply changes
	// to the widget element
	.on('focus', function(e) { input.focus(); e.preventDefault(); })
	.on('change', function() {
	$('li.recipient', list).remove();
	input.val(this.value).change();
	})
	// copy and parse the value already set
	.change();

	// Init autocompletion
	rcmail.init_address_input_events(input);
	};

	/**
	* Parses recipient address input and extracts recipients from it
	*/
	function recipient_input_parser(text)
	{
	// support new-line as a separator, for paste action (#6460)
	text = text.replace(/[,;\s]*[\r\n]+/g, ',').trim();

	var recipients = [],
	address_rx_part = '(\\S+\|("[^"]+"))@\\S+',
	recipient_rx1 = new RegExp('(<' + address_rx_part + '>)'),
	recipient_rx2 = new RegExp('(' + address_rx_part + ')'),
	global_rx = /(?=\S)[^",;](?:"[^\\"](?:\\[,;\S][^\\"])"[^",;])/g,
	matches = text.match(global_rx);

	$.each(matches \|\| [], function() {
	if (this.length && (recipient_rx1.test(this) \|\| recipient_rx2.test(this))) {
	var email, str = this;

	text = text.replace(str, '');

	// Support space-separated email addresses
	while (str.length && str.indexOf(RegExp.$1) === 0) {
	email = RegExp.$1;
	recipients.push({
	name: '',
	email: email.replace(/(^<\|>$)/g, '') // trim < and > characters
	.replace(/[^a-z]$/gi, '') // remove trailing comma or any non-letter character at the end (#7899)
	});

	str = str.replace(email, '').trim();
	if (!recipient_rx1.test(str) && !recipient_rx2.test(str)) {
	break;
	}
	}

	if (email != RegExp.$1 && RegExp.$1) {
	email = RegExp.$1;
	recipients.push({
	name: str.replace(email, '').trim(),
	email: email.replace(/(^<\|>$)/g, '')
	});
	}
	}
	});

	text = text.replace(/[,;]+/, ',').replace(/^[,;\s]+/, '');

	return {recipients: recipients, text: text};
	};

	/**
	* Generates HTML for a text adding <span class="hidden">
	* for quote/backslash characters, so they are hidden from the user,
	* but still in place to make copying simpler
	*
	* Note: Selection works in Chrome, but not in Firefox?
	*/
	function recipient_input_name(text)
	{
	var i, char, result = '', len = text.length;

	if (text.charAt(0) != '"' && text.indexOf('"') > -1) {
	text = '"' + text.replace('\\', '\\\\').replace('"', '\\"') + '"';
	}

	for (i=0; i<len; i++) {
	char = text.charAt(i);
	switch (char) {
	case '"':
	if (i > 0 && i < len - 1) {
	result += '"';
	break;
	}

	result += '<span class="quotes">' + char + '</span>';
	break;

	case '\\':
	result += '<span class="quotes">' + char + '</span>';

	if (text.charAt(i+1) == '\\') {
	result += char;
	i++;
	}
	break;

	case '<':
	result += '<';
	break;

	case '>':
	result += '>';
	break;

	default:
	result += char;
	}
	}

	return result;
	};

	/**
	* Displays dialog to edit a recipient entry
	*/
	function recipient_input_edit_dialog(e, callback)
	{
	var element = $(e.target).parents('.recipient'),
	recipient = element.text().replace(/,+$/, ''),
	input = $('<input>').attr({type: 'text', 'data-submit': 'true'}).val(recipient),
	content = $('<label>').text(rcmail.gettext('recipient')).append(input);

	rcmail.simple_dialog(content, 'recipientedit', function() {
	var result, value = input.val();
	if (value) {
	if (value != recipient) {
	result = recipient_input_parser(value);

	if (result.recipients.length != 1) {
	return false;
	}

	callback(result.recipients[0].name, result.recipients[0].email, element);
	}

	return true;
	}
	});
	};

	/**
	* Adds logic to the contact photo widget
	*/
	function image_upload_input(obj)
	{
	var reset_button = $('<a>')
	.attr({'class': 'icon button delete', href: '#', })
	.click(function(e) { rcmail.command('delete-photo', '', this, e); return false; }),
	img = $(obj).find('img')[0],
	img_onload = function() {
	var state = (img.currentSrc \|\| img.src).indexOf(rcmail.env.photo_placeholder) != -1;
	$(obj)[state ? 'removeClass' : 'addClass']('changed');
	};

	$(obj).append(reset_button).click(function() { rcmail.upload_input('upload-form'); });

	// Note: Looks like only Firefox does not need this separate call
	img_onload();
	$(img).on('load', img_onload);
	};

	/**
	* Displays loading... overlay for iframes
	*/
	function iframe_loader(frame)
	{
	frame = $(frame);

	if (frame.length) {
	var loader = $('<div class="iframe-loader">')
	.append($('<div class="spinner spinner-border" role="status">')
	.append($('<span class="sr-only">').text(rcmail.gettext('loading'))));

	// custom 'loaded' event is expected to be triggered by plugins
	// when using the loader not on an iframe
	frame.on('load error loaded', function() {
	// wait some time to make sure the iframe stopped loading
	setTimeout(function() { loader.remove(); }, 500);
	})
	.parent().append(loader);

	// fix scrolling in iOS
	if (ios) {
	frame.parent().addClass('ios-scroll');
	}
	}
	};

	/**
	* Convert checkbox input into Bootstrap's custom switch
	*/
	function pretty_checkbox(checkbox)
	{
	var label, parent, id;

	checkbox = $(checkbox);

	if (checkbox.is('.custom-control-input')) {
	return;
	}

	if (!(id = checkbox.attr('id'))) {
	id = 'icochk' + (++env.checkboxes);
	checkbox.attr('id', id);
	}

	if (checkbox.parent().is('label')) {
	label = checkbox.parent();
	checkbox = checkbox.detach();
	label.before(checkbox);
	}
	else {
	label = $('<label>');
	}

	label.attr({'for': id, 'class': 'custom-control-label', title: checkbox.attr('title') \|\| ''})
	.on('click', function(e) { e.stopPropagation(); });

	checkbox.addClass('form-check-input custom-control-input')
	.wrap('<div class="custom-control custom-switch">')
	.parent().append(label);
	};

	/**
	* Fix pretty checkbox input in a cloned element
	*/
	function pretty_checkbox_fix(params)
	{
	var id, input = $(params.row).find('input[id^=icochk]');

	if (input.length) {
	id = 'icochk' + (++env.checkboxes);
	input.attr('id', id).next('label').attr('for', id);
	}
	};

	/**
	* Make select dropdowns pretty
	* TODO: searching, optgroup, [multiple], iPhone/iPad
	*/
	function pretty_select(select)
	{
	// iPhone is not supported yet (problem with browser dropdown on focus)
	if (bw.iphone \|\| bw.ipad) {
	return;
	}

	select = $(select);

	if (select.is('.pretty-select')) {
	return;
	}

	var select_ident = 'select' + select.attr('id') + select.attr('name');
	var is_menu_open = function() {
	// Use proper window in cases when the select element initialized
	// inside an iframe is then used in a dialog inside a parent's window
	// For some reason we can't access data-button property in cross-window
	// case, we use data-ident attribute instead
	var win = select[0].ownerDocument.defaultView;
	if (win.$('.select-menu .listing').data('ident') == select_ident) {
	return true;
	}
	};

	var close_func = function() {
	var open = is_menu_open();
	select.popover('dispose').focus();
	return !open;
	};

	var open_func = function(e) {
	var last_char, last_index = -1, items = [], index = [],
	dialog = select.closest('.ui-dialog')[0],
	max_height = (document.documentElement.clientHeight \|\| $(document.body).height()) - 75,
	max_width = $(document.body).width() - 20,
	min_width = Math.min(select.outerWidth(), max_width),
	value = select.val();

	if (!is_mobile()) {
	max_height *= 0.5;
	}

	// close other popups
	popups_close(e);

	$('option', select).each(function() {
	var label = $(this).text(),
	link = $('<a href="#">')
	.data('value', this.value)
	.addClass(this.disabled ? 'disabled' : 'active' + (this.value == value ? ' selected' : ''));

	if (label.length) {
	link.text(label);
	index.push(this.disabled ? '' : label.charAt(0).toLowerCase());
	}
	else {
	link.html(' '); // link can't be empty
	index.push('');
	}

	items.push($('<li>').append(link));
	});

	var list = $('<ul class="listing selectable iconized">')
	.attr('data-ident', select_ident)
	.data('button', select[0])
	.append(items)
	.on('click', 'a.active', function() {
	// first close the list, then update the select, the order is important
	// for cases when the select might be removed in change event (datepicker)
	var val = $(this).data('value'), ret = close_func();
	select.val(val).change();
	return ret;
	})
	.on('keydown', 'a.active', function(e) {
	var item, char, last, node, mode = 'next';

	switch (e.which) {
	case 27: // ESC
	case 9: // TAB
	return close_func();

	case 13: // ENTER
	case 32: // SPACE
	$(this).click();
	return false; // for IE

	case 38: // ARROW-UP
	case 63232:
	mode = 'previous';
	// no-break
	case 40: // ARROW-DOWN
	case 63233:
	item = e.target.parentNode;
	while (item = item[mode + 'Sibling']) {
	if (node = $(item).children('.active')[0]) {
	node.focus();
	break;
	}
	}
	return false; // prevents from scrolling the whole page

	default:
	// A letter key has been pressed, search mode
	char = e.originalEvent.key;

	if (char && char.length == 1) {
	char = char.toLowerCase();

	if (last_char != char) {
	last_index = -1;
	}

	last = index.indexOf(char, last_index + 1);

	if (last > -1 \|\| (last = index.indexOf(char)) > -1) {
	list.find('a').eq(last).focus();
	}

	last_char = char;
	last_index = last;
	}
	}
	});

	select.popover('dispose')
	.popover({
	// because of focus issues we can't always use body,
	// if select is in a dialog, popover has to be a child of this dialog
	container: dialog \|\| document.body,
	content: list[0],
	placement: 'bottom',
	trigger: 'manual',
	boundary: 'viewport',
	html: true,
	offset: '0,2',
	sanitize: false,
	template: '<div class="popover select-menu" style="min-width: ' + min_width + 'px; max-width: ' + max_width + 'px">'
	+ '<div class="popover-header"></div>'
	+ '<div class="popover-body" style="max-height: ' + max_height + 'px"></div></div>'
	})
	.on('shown.bs.popover', function() {
	select.focus(); // for Chrome
	// Set popup Close title
	list.parent().prev()
	.empty()
	.append($('<a class="button icon cancel">').text(rcmail.gettext('close'))
	.on('click', function(e) {
	e.stopPropagation();
	return close_func();
	})
	);

	// Find the selected item, focus it
	var selected = list.find('a.selected').first();
	if (selected.focus().length) {
	var list_parent = list.parent();

	last_index = list.find('a').index(selected[0]);
	last_char = index[last_index];

	// try to scroll the list so focused element is in center (for Firefox)
	if (bw.mz && last_index > 5) {
	list_parent.scrollTop(list_parent.scrollTop() + list_parent.height()/2 - 20);
	}
	}
	// focus first active element on the list
	else if (rcube_event.is_keyboard(e)) {
	list.find('a.active').first().focus();
	}

	// don't propagate mousedown event
	list.on('mousedown', function(e) { e.stopPropagation(); });
	})
	.popover('show');
	};

	select.addClass('pretty-select custom-select form-control')
	.on('mousedown keydown', function(e) {
	select = $(e.target); // so it works after clone

	// Do nothing on disabled select or on TAB key
	if (select.prop('disabled')) {
	return;
	}

	if (e.which == 9) {
	close_func();
	return true;
	}

	// Close popup on ESC key or on click if already open
	if (e.which == 27 \|\| (e.type == 'mousedown' && is_menu_open())) {
	return close_func();
	}

	select.focus();

	// prevent displaying browser-default select dropdown
	select.prop('disabled', true);
	setTimeout(function() { select.prop('disabled', false); }, 0);
	e.stopPropagation();

	// display options in our way (on SPACE, ENTER, ARROW-DOWN or mousedown)
	if (e.type == 'mousedown' \|\| e.which == 13 \|\| e.which == 32 \|\| e.which == 40 \|\| e.which == 63233) {
	open_func(e);

	// Prevent from closing the menu by general popover closing handler (popups_close())
	// We used to just stop propagation in onclick handler, but it didn't work
	// in Chrome where onclick handler wasn't invoked on mobile (#6705)
	popups_close_lock = new Date().getTime();

	return false;
	}
	})
	};

	/**
	* HTML editor textarea wrapper with plain-to-html switch button
	*/
	function html_editor_init(obj)
	{
	// Here we support two kinds of structure:
	// 1. <div><textarea></textarea><select class="hidden"></div>
	// 2. <tr><td><td><td><textarea></textarea></td></tr>
	// <tr><td><td><td><input type="checkbox"></td></tr>

	var sw, is_table = false,
	editor = $(obj),
	parent = editor.parent(),
	readonly = editor.is('[readonly],[disabled]'),
	plain_btn = $('<a class="mce-i-html" href="#" tabindex="-1"></a>')
	.attr({title: rcmail.gettext('htmltoggle'), disabled: readonly})
	.on('click', function(e) {
	if (!readonly && rcmail.command('toggle-editor', {id: editor.attr('id'), html: true}, '', e.originalEvent)) {
	parent.addClass('ishtml');
	}
	})
	.on('keydown', function(e) {
	if (e.which == 9) { // TAB
	editor.focus();
	return false;
	}
	}),
	toolbar = $('<div class="editor-toolbar">').append(plain_btn);

	if (parent.is('td')) {
	sw = $('input[type="checkbox"]', parent.parent().next());
	is_table = true;
	}
	else {
	sw = editor.next('select.hidden');
	}

	// make the textarea autoresizeable
	textarea_autoresize_init(obj);

	// sanity check
	if (sw.length != 1) {
	return;
	}

	parent.addClass('html-editor');

	editor.after(toolbar).data('control', sw)
	.on('keydown', function(e) {
	// ALT + F10 is the way to access toolbar in TinyMCE, let's do the same for plain editor
	if (e.altKey && e.which == 121) {
	plain_btn.focus();
	}
	});

	if (is_table) {
	// Hide unwanted table cells
	sw.parents('tr').first().hide();
	parent.prev().hide();
	// Modify the textarea cell to use 100% width
	parent.addClass('col-sm-12');
	}
	};

	/**
	* Make the textarea autoresizeable depending on it's content length.
	* The way there's no vertical scrollbar.
	*/
	function textarea_autoresize_init(textarea)
	{
	var padding, minHeight,
	resize = function() {
	// Wait until the textarea is visible
	if (!textarea.scrollHeight) {
	return setTimeout(resize, 250);
	}

	if (!padding) {
	padding = parseInt($(textarea).css('padding-top')) + parseInt($(textarea).css('padding-bottom')) + 2;
	minHeight = $(textarea).height();
	}

	if (textarea.scrollHeight - padding <= minHeight) {
	return;
	}

	// To fix scroll-jump we'll re-apply scrollTop to the (scrolled) parent
	// after we reset textarea height
	var scroll_element, scroll_pos = 0;
	$(textarea).parents().each(function() {
	if (this.scrollTop > 0) {
	scroll_element = this;
	scroll_pos = this.scrollTop;
	return false;
	}
	});

	var oldHeight = $(textarea).outerHeight();
	$(textarea).outerHeight(0);
	var newHeight = Math.max(minHeight, textarea.scrollHeight);
	$(textarea).outerHeight(oldHeight);
	if (newHeight !== oldHeight) {
	$(textarea).height(newHeight);
	}

	if (scroll_pos) {
	scroll_element.scrollTop = scroll_pos;
	}
	};

	$(textarea).on('input', resize).trigger('input');
	};

	// Initializes smart list input
	function smart_field_init(field)
	{
	var tip, id = field.id + '_list',
	area = $('<div class="multi-input"><div class="content"></div><div class="invalid-feedback"></div></div>'),
	list = field.value ? field.value.split("\n") : [''];

	if ($('#' + id).length) {
	return;
	}

	// add input rows
	$.each(list, function(i, v) {
	smart_field_row_add($('.content', area), v, i, field);
	});

	area.attr('id', id);
	field = $(field);

	if (field.attr('disabled')) {
	area.hide();
	}
	// disable the original field anyway, we don't want it in POST
	else {
	field.prop('disabled', true);
	}

	if (field.data('hidden')) {
	area.hide();
	}

	field.after(area);

	if (field.hasClass('is-invalid')) {
	area.addClass('is-invalid');
	$('.invalid-feedback', area).text(field.data('error-msg'));
	}
	};

	function smart_field_row_add(area, value, idx, field, after)
	{
	// build row element content
	var input,
	elem = $('<div class="input-group">'
	+ '<input type="text" class="form-control">'
	+ '<span class="input-group-append"><a class="icon reset input-group-text" href="#"></a></span>'
	+ '</div>');

	input = elem.find('input').attr({
	value: value,
	name: field.name + '[]',
	size: $(field).data('size'),
	title: field.title,
	placeholder: field.placeholder
	})
	.keydown(function(e) {
	// element creation event (on Enter)
	if (e.which == 13) {
	var elem = smart_field_row_add(area, '', (new Date()).getTime(), field, input.parent());

	$('input', elem).focus();
	}
	// backspace or delete: remove input, focus previous one
	else if ((e.which == 8 \|\| e.which == 46) && input.val() == '') {
	var parent = input.parent(),
	siblings = area.children();

	if (siblings.length > 1) {
	if (parent.prev().length) {
	parent.prev().children('input').focus();
	}
	else {
	parent.next().children('input').focus();
	}

	parent.remove();
	return false;
	}
	}
	});

	// element deletion event
	elem.find('a.reset').click(function() {
	var record = $(this.parentNode.parentNode);

	if (area.children().length > 1) {
	$('input', record.next().length ? record.next() : record.prev()).focus();
	record.remove();
	}
	else {
	$('input', record).val('').focus();
	}
	});

	elem.find('input,a')
	.on('focus', function() { area.addClass('focused'); })
	.on('blur', function() { area.removeClass('focused'); });

	if (after) {
	after.after(elem);
	}
	else {
	elem.appendTo(area);
	}

	return elem;
	};

	// Reset and fill the smart list input with new data
	function smart_field_reset(field, data)
	{
	var id = field.id + '_list',
	list = data.length ? data : [''],
	area = $('#' + id).children('.content');

	area.empty();

	// add input rows
	$.each(list, function(i, v) {
	smart_field_row_add(area, v, i, field);
	});
	};

	/**
	* Register form errors, mark fields as invalid, display the error below the input
	*/
	function form_errors(tips)
	{
	$.each(tips, function() {
	var input = $('#' + this[0]).addClass('is-invalid');

	if (input.data('type') == 'list') {
	input.data('error-msg', this[2]);
	$('#' + this[0] + '_list > .invalid-feedback').text(this[2]);
	return;
	}

	input.after($('<span class="invalid-feedback">').text(this[2]));
	});
	};

	/**
	* Show/hide the navigation list
	*/
	function switch_nav_list(obj)
	{
	var records, height, speed = 250,
	button = $('a', obj),
	navlist = $(obj).next();

	if (!navlist.height()) {
	records = $('tr,li', navlist).filter(function() { return this.style.display != 'none'; });
	height = $(records[0]).height() \|\| 50;

	navlist.animate({height: (Math.min(5, records.length) * height + 1) + 'px'}, speed);
	button.addClass('collapse').removeClass('expand');
	$(obj).addClass('expanded');
	}
	else {
	navlist.animate({height: '0'}, speed);
	button.addClass('expand').removeClass('collapse');
	$(obj).removeClass('expanded');
	}
	};

	/**
	* Create a splitter (resizing) element on a layout column
	*/
	function splitter_init(node)
	{
	// Use id of the list element, if exists, as a part of the key, instead of action.column-id
	// This way e.g. the sidebar in Settings is always the same width for all Settings' pages
	var list_id = node.find('.scroller .listing').first().attr('id'),
	key = rcmail.env.task + '.' + (list_id \|\| (rcmail.env.action + '.' + node.attr('id'))),
	pos = get_pref(key),
	inverted = node.is('.sidebar-right'),
	set_width = function(width) {
	node.css({
	width: Math.max(100, width),
	// reset default properties
	// 'min-width': 100,
	flex: 'none'
	});
	};

	if (!node[inverted ? 'prev' : 'next']().length) {
	return;
	}

	$('<div class="column-resizer">')
	.addClass(inverted ? 'inverted' : null)
	.appendTo(node)
	.on('mousedown', function(e) {
	var ts, splitter = $(this), offset = node.position().left;

	// Makes col-resize cursor follow the mouse pointer on dragging
	// and fixes issues related to iframes
	splitter.addClass('active');

	// Disable selection on document while dragging
	// It can happen when you move mouse out of window, on top
	document.body.style.userSelect = 'none';

	// Start listening to mousemove events
	$(document)
	.on('mousemove.resizer', function(e) {
	// Use of timeouts makes the move more smooth in Chrome
	clearTimeout(ts);
	ts = setTimeout(function() {
	// For left-side-splitter we need the current offset
	if (inverted) {
	offset = node.position().left;
	}
	var cursor_position = rcube_event.get_mouse_pos(e).x,
	width = inverted ? node.width() + (offset - cursor_position) : cursor_position - offset;

	set_width(width);
	}, 5);
	})
	.on('mouseup.resizer', function() {
	// Remove registered events
	$(document).off('.resizer');
	$('iframe').off('.resizer');
	document.body.style.userSelect = 'auto';

	// Set back the splitter width to normal
	splitter.removeClass('active');

	// Save the current position (width)
	set_pref(key, node.width());
	});
	});

	if (pos) {
	set_width(pos);
	}
	};

	/**
	* Wrapper for rcmail.open_window to intercept window opening
	* and display a dialog with an iframe instead of a real window.
	*/
	function window_open(url, small, toolbar, force_window)
	{
	var colorFunc = function (body) {
	$(body).css({
	color: $(document.body).css('color'),
	backgroundColor: $(document.body).css('background-color')
	})
	};

	var setColor = color_mode == 'dark' && /_task=mail/.test(url) && /_action=viewsource/.test(url);

	// Use 4th argument to bypass the dialog-mode e.g. for external windows
	if (!is_mobile() \|\| force_window === true) {
	// On attachment preview page we do not display the properties sidebar
	// so we can use a smaller window, as we do for print pages
	if (/_task=mail/.test(url) && /_action=get/.test(url)) {
	small = true;
	}

	var win = env.open_window.call(rcmail, url, small, toolbar);

	// Switch the plain/text window to dark-mode
	if (setColor) {
	$(win).on('load', function() { colorFunc(win.document.body); });
	}

	return win;
	}

	// _extwin=1, _framed=1 are required to display attachment preview
	// layout properly and make mobile menus working
	url = rcmail.add_url(url, '_framed', 1);
	url = rcmail.add_url(url, '_extwin', 1);

	var label, title = '',
	props = {cancel_button: 'close', width: 768, height: 768},
	frame = $('<iframe>').attr({id: 'windowframe', src: url});

	if (/_action=([a-z_]+)/.test(url) && (label = rcmail.labels[RegExp.$1])) {
	title = label;
	}

	if (/_frame=1/.test(url)) {
	props.dialogClass = 'no-titlebar';
	}

	// Switch the plain/text iframe to dark-mode
	if (setColor) {
	frame.on('load', function() { colorFunc(frame[0].contentWindow.document.body); });
	}

	rcmail.simple_dialog(frame, title, null, props);

	return true;
	};

	/**
	* Get layout modes. In frame mode returns the parent layout modes.
	*/
	function layout_metadata()
	{
	if (is_framed) {
	var doc = $(parent.document.documentElement);

	return {
	mode: doc[0].className.match(/layout-([a-z]+)/) ? RegExp.$1 : mode,
	touch: doc.is('.touch'),
	};
	}

	return {mode: mode, touch: touch};
	};

	/**
	* Returns true if the layout is in 'small' or 'phone' mode
	*/
	function is_mobile()
	{
	var meta = layout_metadata();

	return meta.mode == 'phone' \|\| meta.mode == 'small';
	};

	/**
	* Returns true if the layout is in 'touch' mode
	*/
	function is_touch()
	{
	var meta = layout_metadata();

	return meta.touch;
	};

	/**
	* Get preference stored in browser
	*/
	function get_pref(key)
	{
	if (!prefs) {
	prefs = rcmail.local_storage_get_item('prefs.elastic', {});
	}

	// fall-back to cookies
	if (prefs[key] == null) {
	var cookie = rcmail.get_cookie(key);
	if (cookie != null) {
	prefs[key] = cookie;

	// copy value to local storage and remove cookie (if localStorage is supported)
	if (rcmail.local_storage_set_item('prefs.elastic', prefs)) {
	rcmail.set_cookie(key, cookie, new Date()); // expire cookie
	}
	}
	}

	return prefs[key];
	};

	/**
	* Saves preference value to browser storage
	*/
	function set_pref(key, val)
	{
	prefs[key] = val;

	// write prefs to local storage (if supported)
	if (!rcmail.local_storage_set_item('prefs.elastic', prefs)) {
	// store value in cookie
	rcmail.set_cookie(key, val, false);
	}
	};
	}

	if (window.rcmail) {
	/**
	* Elastic version of show_menu as we don't need e.g. menu positioning from core
	* TODO: keyboard navigation in menus
	*/
	rcmail.show_menu = function(prop, show, event)
	{
	var name = typeof prop == 'object' ? prop.menu : prop,
	obj = $('#' + name);

	if (typeof prop == 'string') {
	prop = {menu: name};
	}

	// just delegate the action to rcube_elastic_ui
	return rcmail.triggerEvent(show === false ? 'menu-close' : 'menu-open', {name: name, obj: obj, props: prop, originalEvent: event});
	}

	/**
	* Elastic version of hide_menu as we don't need e.g. menus stack handling
	*/
	rcmail.hide_menu = function(name, event)
	{
	// delegate to rcube_elastic_ui
	return rcmail.triggerEvent('menu-close', {name: name, props: {menu: name}, originalEvent: event});
	}
	}
	else {
	// rcmail does not exists e.g. on the error template inside a frame
	// we fake the engine a little
	var rcmail = parent.rcmail,
	rcube_webmail = parent.rcube_webmail,
	bw = {};
	}

	var UI = new rcube_elastic_ui();

	// Improve non-inline datepickers
	if ($ && $.datepicker) {
	var __newInst = $.datepicker._newInst;

	$.extend($.datepicker, {
	_newInst: function(target, inline) {
	var inst = __newInst.call(this, target, inline);

	if (!inst.inline) {
	UI.datepicker_init(inst.dpDiv);
	}

	return inst;
	}
	});
	}

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