diff --git a/plugins/managesieve/managesieve.js b/plugins/managesieve/managesieve.js
index 7d64d9fe6..5b0562f0f 100644
--- a/plugins/managesieve/managesieve.js
+++ b/plugins/managesieve/managesieve.js
@@ -1,1219 +1,1219 @@
 /**
  * (Manage)Sieve Filters plugin
  *
  * @licstart  The following is the entire license notice for the
  * JavaScript code in this file.
  *
  * Copyright (c) The Roundcube Dev Team
  *
  * The JavaScript code in this page is free software: you can redistribute it
  * and/or modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation, either version 3 of
  * the License, or (at your option) any later version.
  *
  * @licend  The above is the entire license notice
  * for the JavaScript code in this file.
  */
 
 if (window.rcmail) {
   rcmail.addEventListener('init', function(evt) {
     // add managesieve-create command to message_commands array,
     // so it's state will be updated on message selection/unselection
     if (rcmail.env.task == 'mail') {
       if (rcmail.env.action != 'show')
         rcmail.env.message_commands.push('managesieve-create');
       else
         rcmail.enable_command('managesieve-create', true);
     }
 
-    if (rcmail.env.task == 'mail' || rcmail.env.action.startsWith('plugin.managesieve')) {
+    if (rcmail.env.task == 'mail' || (rcmail.env.action && rcmail.env.action.startsWith('plugin.managesieve'))) {
       // Create layer for form tips
       if (!rcmail.env.framed) {
         rcmail.env.ms_tip_layer = $('<div id="managesieve-tip" class="popupmenu"></div>');
         rcmail.env.ms_tip_layer.appendTo(document.body);
       }
     }
 
     // register commands
     rcmail.register_command('plugin.managesieve-save', function() { rcmail.managesieve_save() });
     rcmail.register_command('plugin.managesieve-act', function() { rcmail.managesieve_act() });
     rcmail.register_command('plugin.managesieve-add', function() { rcmail.managesieve_add() });
     rcmail.register_command('plugin.managesieve-del', function() { rcmail.managesieve_del() });
     rcmail.register_command('plugin.managesieve-move', function() { rcmail.managesieve_move() });
     rcmail.register_command('plugin.managesieve-setadd', function() { rcmail.managesieve_setadd() });
     rcmail.register_command('plugin.managesieve-setdel', function() { rcmail.managesieve_setdel() });
     rcmail.register_command('plugin.managesieve-setact', function() { rcmail.managesieve_setact() });
     rcmail.register_command('plugin.managesieve-setget', function() { rcmail.managesieve_setget() });
     rcmail.register_command('plugin.managesieve-seteditraw', function() { rcmail.managesieve_seteditraw() });
 
-    if (rcmail.env.action.startsWith('plugin.managesieve')) {
+    if (rcmail.env.action && rcmail.env.action.startsWith('plugin.managesieve')) {
       if (rcmail.gui_objects.sieveform) {
         rcmail.enable_command('plugin.managesieve-save', true);
         sieve_form_init();
       }
       else if (rcmail.gui_objects.sievesetrawform) {
         rcmail.enable_command('plugin.managesieve-save', true);
         sieve_raw_editor_init();
       }
       else {
         rcmail.enable_command('plugin.managesieve-add', !rcmail.env.sieveconnerror && $.inArray('new_filter', rcmail.env.managesieve_disabled_actions) == -1);
         rcmail.enable_command('plugin.managesieve-setadd', !rcmail.env.sieveconnerror && $.inArray('new_set', rcmail.env.managesieve_disabled_actions) == -1);
       }
 
       var setcnt, set = rcmail.env.currentset;
 
       if (rcmail.gui_objects.filterslist) {
         rcmail.filters_list = new rcube_list_widget(rcmail.gui_objects.filterslist,
           {multiselect:false, draggable:true, keyboard:true});
 
         rcmail.filters_list
           .addEventListener('select', function(o) { rcmail.managesieve_select(o); })
           .addEventListener('keypress', function(o) { rcmail.list_keypress(o, {del: 'plugin.managesieve-del'}); })
           .addEventListener('dragstart', function(o) { rcmail.managesieve_dragstart(o); })
           .addEventListener('dragend', function(o) { rcmail.managesieve_dragend(o); })
           .addEventListener('initrow', function(row) {
             row.obj.onmouseover = function() { rcmail.managesieve_focus_filter(row); };
             row.obj.onmouseout = function() { rcmail.managesieve_unfocus_filter(row); };
           })
           .init();
       }
 
       if (rcmail.gui_objects.filtersetslist) {
         rcmail.filtersets_list = new rcube_list_widget(rcmail.gui_objects.filtersetslist,
           {multiselect:false, draggable:false, keyboard:true});
 
         rcmail.filtersets_list.init().focus();
 
         if (set != null) {
           $('#filterset-name').text(set);
           set = rcmail.managesieve_setid(set);
           rcmail.filtersets_list.select(set);
         }
 
         // attach select event after initial record was selected
         rcmail.filtersets_list.addEventListener('select', function(e) { rcmail.managesieve_setselect(e); });
 
         setcnt = rcmail.filtersets_list.rowcount;
         rcmail.enable_command('plugin.managesieve-set', true);
         rcmail.enable_command('plugin.managesieve-setact', setcnt > 0 && $.inArray('enable_disable_set', rcmail.env.managesieve_disabled_actions) == -1);
         rcmail.enable_command('plugin.managesieve-setget', setcnt > 0 && $.inArray('download_set', rcmail.env.managesieve_disabled_actions) == -1);
         rcmail.enable_command('plugin.managesieve-setdel', setcnt > 1 && $.inArray('delete_set', rcmail.env.managesieve_disabled_actions) == -1);
         rcmail.enable_command('plugin.managesieve-seteditraw', setcnt > 0 && rcmail.env.raw_sieve_editor);
 
         // Fix dragging filters over sets list
         $('tr', rcmail.gui_objects.filtersetslist).each(function (i, e) { rcmail.managesieve_fixdragend(e); });
       }
     }
   });
 };
 
 /*********************************************************/
 /*********       Managesieve UI methods          *********/
 /*********************************************************/
 
 rcube_webmail.prototype.managesieve_add = function()
 {
   this.load_managesieveframe('_nav=hide', true);
 };
 
 rcube_webmail.prototype.managesieve_del = function()
 {
   var id = this.filters_list.get_single_selection();
   this.confirm_dialog(this.get_label('managesieve.filterdeleteconfirm'), 'delete', function(e, ref) {
       var post = '_act=delete&_fid=' + ref.filters_list.rows[id].uid,
         lock = ref.set_busy(true, 'loading');
 
       ref.http_post('plugin.managesieve-action', post, lock);
     });
 };
 
 rcube_webmail.prototype.managesieve_act = function()
 {
   var id = this.filters_list.get_single_selection(),
     lock = this.set_busy(true, 'loading');
 
   this.http_post('plugin.managesieve-action',
     '_act=act&_fid='+this.filters_list.rows[id].uid, lock);
 };
 
 // Filter selection
 rcube_webmail.prototype.managesieve_select = function(list)
 {
   var id = list.get_single_selection();
 
   if (id != null) {
     id = list.rows[id].uid;
     this.load_managesieveframe('_fid=' + id);
   }
 
   var has_id = typeof(id) != 'undefined' && id != null;
 
   this.enable_command('plugin.managesieve-act', has_id);
   this.enable_command('plugin.managesieve-del', has_id && $.inArray('delete_filter', rcmail.env.managesieve_disabled_actions) == -1);
 };
 
 // Set selection
 rcube_webmail.prototype.managesieve_setselect = function(list)
 {
   this.enable_command('plugin.managesieve-setdel', list.rowcount > 1 && $.inArray('delete_set', rcmail.env.managesieve_disabled_actions) == -1);
   this.enable_command('plugin.managesieve-setact', list.rowcount > 0 && $.inArray('enable_disable_set', rcmail.env.managesieve_disabled_actions) == -1);
   this.enable_command('plugin.managesieve-setget', list.rowcount > 0 && $.inArray('delete_set', rcmail.env.managesieve_disabled_actions) == -1);
   this.enable_command('plugin.managesieve-seteditraw', list.rowcount > 0 && this.env.raw_sieve_editor);
 
  if (rcmail.env.contextmenu_opening)
    return;
 
   this.show_contentframe(false);
   this.filters_list.clear(true);
 
   var id = list.get_single_selection();
   if (id != null) {
     this.managesieve_list(this.env.filtersets[id]);
     $('#filterset-name').text(this.env.filtersets[id]);
   }
 };
 
 rcube_webmail.prototype.managesieve_rowid = function(id)
 {
   var i, rows = this.filters_list.rows;
 
   for (i in rows)
     if (rows[i] != null && rows[i].uid == id)
       return i;
 };
 
 // Returns set's identifier
 rcube_webmail.prototype.managesieve_setid = function(name)
 {
   for (var i in this.env.filtersets)
     if (this.env.filtersets[i] == name)
       return i;
 };
 
 // Filters listing request
 rcube_webmail.prototype.managesieve_list = function(script)
 {
   var lock = this.set_busy(true, 'loading');
 
   this.http_post('plugin.managesieve-action', '_act=list&_set='+urlencode(script), lock);
 };
 
 // Script download request
 rcube_webmail.prototype.managesieve_setget = function()
 {
   var id = this.filtersets_list.get_single_selection(),
     script = this.env.filtersets[id];
 
   this.goto_url('plugin.managesieve-action', {_act: 'setget', _set: script}, false, true);
 };
 
 // Set activate/deactivate request
 rcube_webmail.prototype.managesieve_setact = function()
 {
   var id = this.filtersets_list.get_single_selection(),
    lock = this.set_busy(true, 'loading'),
     script = this.env.filtersets[id],
     action = $('#rcmrow'+id).hasClass('disabled') ? 'setact' : 'deact';
 
   this.http_post('plugin.managesieve-action', '_act='+action+'&_set='+urlencode(script), lock);
 };
 
 // Set delete request
 rcube_webmail.prototype.managesieve_setdel = function()
 {
   var id = this.filtersets_list.get_single_selection();
   this.confirm_dialog(this.get_label('managesieve.setdeleteconfirm'), 'delete', function(e, ref) {
       var script = ref.env.filtersets[id],
         lock = ref.set_busy(true, 'loading');
 
       ref.http_post('plugin.managesieve-action', '_act=setdel&_set=' + urlencode(script), lock);
     });
 };
 
 // Set edit raw request
 rcube_webmail.prototype.managesieve_seteditraw = function()
 {
   var id = this.filtersets_list.get_single_selection(),
     script = this.env.filtersets[id];
 
   this.load_managesieveframe('_nav=hide&_seteditraw=1&_set=' + urlencode(script), true);
 };
 
 // Set add request
 rcube_webmail.prototype.managesieve_setadd = function()
 {
   this.load_managesieveframe('_nav=hide&_newset=1', true);
 };
 
 rcube_webmail.prototype.managesieve_updatelist = function(action, o)
 {
   this.set_busy(true);
 
   switch (action) {
     // Delete filter row
     case 'del':
       var id = o.id, list = this.filters_list;
 
       list.remove_row(this.managesieve_rowid(o.id));
       this.show_contentframe(false);
       this.reset_filters_list();
 
       // filter identifiers changed, fix the list
       $('tr', this.filters_list.list).each(function() {
         // remove hidden (deleted) rows
         if (this.style.display == 'none') {
           $(this).detach();
           return;
         }
 
         var rowid = this.id.substr(6);
 
         // remove all attached events
         $(this).off();
 
         // update row id
         if (rowid > id) {
           this.uid = String(rowid - 1);
           $(this).attr('id', 'rcmrow' + this.uid);
         }
       });
       list.init();
 
       break;
 
     // Update filter row
     case 'update':
       var i, row = $('#rcmrow'+this.managesieve_rowid(o.id));
 
       if (o.name)
         $('td', row).text(o.name);
       if (o.disabled)
         row.addClass('disabled');
       else
         row.removeClass('disabled');
 
       $('#fenabled', $('iframe').contents()).prop('checked', !o.disabled);
 
       break;
 
     // Add filter row to the list
     case 'add':
       var list = this.filters_list,
         row = $('<tr><td class="name"></td></tr>');
 
       $('td', row).text(o.name);
       row.attr('id', 'rcmrow'+o.id);
       if (o.disabled)
         row.addClass('disabled');
 
       list.insert_row(row.get(0));
       list.highlight_row(o.id);
 
       this.enable_command('plugin.managesieve-del', $.inArray('delete_rule', rcmail.env.managesieve_disabled_actions) == -1);
       this.enable_command('plugin.managesieve-act', true);
 
       break;
 
     // Filling rules list
     case 'list':
       var i, tr, td, el, list = this.filters_list;
 
       if (o.clear)
         list.clear();
 
       for (i in o.list) {
         el = o.list[i];
         tr = document.createElement('TR');
         td = document.createElement('TD');
 
         $(td).text(el.name);
         td.className = 'name';
         tr.id = 'rcmrow' + el.id;
         if (el['class'])
             tr.className = el['class'];
         tr.appendChild(td);
 
         list.insert_row(tr);
       }
 
       if (o.set)
         list.highlight_row(o.set);
       else
         this.enable_command('plugin.managesieve-del', 'plugin.managesieve-act', false);
 
       break;
 
     // Activate/Deactivate the set
     case 'setact':
       var id = this.managesieve_setid(o.name), row = $('#rcmrow' + id);
       if (o.active) {
         if (o.all)
           $('tr', this.gui_objects.filtersetslist).addClass('disabled');
         row.removeClass('disabled');
       }
       else
         row.addClass('disabled');
 
       break;
 
     // Delete set row
     case 'setdel':
       var id = this.managesieve_setid(o.name);
 
       this.filters_list.clear();
       this.show_contentframe(false);
       this.enable_command('plugin.managesieve-setdel', 'plugin.managesieve-setact',
         'plugin.managesieve-setget', 'plugin.managesieve-seteditraw', false);
 
       this.filtersets_list.remove_row(id, true);
       delete this.env.filtersets[id];
       break;
 
     // Create set row
     case 'setadd':
       var id = 'S' + new Date().getTime(),
         list = this.filtersets_list,
         row = $('<tr class="disabled"><td class="name"></td></tr>');
 
       $('td', row).text(o.name);
       row.attr('id', 'rcmrow'+id);
 
       this.env.filtersets[id] = o.name;
       list.insert_row(row.get(0));
 
       // move row into its position on the list
       if (o.index != list.rowcount-1) {
         row.detach();
         var elem = $('tr:visible', list.list).get(o.index);
         row.insertBefore(elem);
       }
 
       list.select(id);
 
       // Fix dragging filters over sets list
       this.managesieve_fixdragend(row);
 
       break;
 
     case 'refresh':
       this.reset_filters_list(true);
       break;
   }
 
   this.set_busy(false);
 };
 
 // Resets filters list state
 rcube_webmail.prototype.reset_filters_list = function(reload)
 {
   this.filters_list.clear_selection();
   this.enable_command('plugin.managesieve-act', 'plugin.managesieve-del', false);
 
   if (reload) {
     var id = this.filtersets_list.get_single_selection();
 
     this.filters_list.clear(true);
     this.managesieve_list(this.env.filtersets[id]);
   }
 };
 
 // load filter frame
 rcube_webmail.prototype.load_managesieveframe = function(add_url, reset)
 {
   if (reset)
     this.reset_filters_list();
 
   var target = this.get_frame_window(this.env.contentframe),
     url = this.url('plugin.managesieve-action', '_framed=1' + (add_url ? ('&' + add_url) : ''));
 
   if (target) {
     this.location_href(url, target, true);
   }
 };
 
 // load filter frame
 rcube_webmail.prototype.managesieve_dragstart = function(list)
 {
   var id = this.filters_list.get_single_selection();
 
   this.drag_active = true;
   this.drag_filter = id;
 };
 
 rcube_webmail.prototype.managesieve_dragend = function(e)
 {
   if (this.drag_active) {
     if (this.drag_filter_target) {
       var lock = this.set_busy(true, 'loading');
 
       this.show_contentframe(false);
       this.http_post('plugin.managesieve-action', '_act=move&_fid='+this.drag_filter
         +'&_to='+this.drag_filter_target, lock);
     }
     this.drag_active = false;
   }
 };
 
 // Fixes filters dragging over sets list
 // @TODO: to be removed after implementing copying filters
 rcube_webmail.prototype.managesieve_fixdragend = function(elem)
 {
   var p = this;
   $(elem).on('mouseup' + ((bw.iphone || bw.ipad) ? ' touchend' : ''), function(e) {
     if (p.drag_active)
       p.filters_list.drag_mouse_up(e);
   });
 };
 
 rcube_webmail.prototype.managesieve_focus_filter = function(row)
 {
   var id = row.id.replace(/^rcmrow/, '');
   if (this.drag_active && id != this.drag_filter) {
     this.drag_filter_target = id;
     $(row.obj).addClass(id < this.drag_filter ? 'filtermoveup' : 'filtermovedown');
   }
 };
 
 rcube_webmail.prototype.managesieve_unfocus_filter = function(row)
 {
   if (this.drag_active) {
     $(row.obj).removeClass('filtermoveup filtermovedown');
     this.drag_filter_target = null;
   }
 };
 
 /*********************************************************/
 /*********          Filter Form methods          *********/
 /*********************************************************/
 
 // Form submission
 rcube_webmail.prototype.managesieve_save = function()
 {
   if (this.env.action == 'plugin.managesieve-vacation') {
     var data = $(this.gui_objects.sieveform).serialize();
     this.http_post('plugin.managesieve-vacation', data, this.display_message(this.get_label('managesieve.vacation.saving'), 'loading'));
     return;
   }
 
   if (this.env.action == 'plugin.managesieve-forward') {
     var data = $(this.gui_objects.sieveform).serialize();
     this.http_post('plugin.managesieve-forward', data, this.display_message(this.get_label('managesieve.forward.saving'), 'loading'));
     return;
   }
 
   if (this.gui_objects.sieveform) {
     if (parent.rcmail && parent.rcmail.filters_list && this.gui_objects.sieveform.name != 'filtersetform') {
       var id = parent.rcmail.filters_list.get_single_selection();
       if (id != null)
         this.gui_objects.sieveform.elements['_fid'].value = parent.rcmail.filters_list.rows[id].uid;
     }
     this.gui_objects.sieveform.submit();
   }
   else if (this.gui_objects.sievesetrawform) {
     this.gui_objects.sievesetrawform.submit();
   }
 };
 
 // Operations on filters form
 rcube_webmail.prototype.managesieve_ruleadd = function(id)
 {
   this.http_post('plugin.managesieve-action', '_act=ruleadd&_rid='+id);
 };
 
 rcube_webmail.prototype.managesieve_rulefill = function(content, id, after)
 {
   if (content != '') {
     // create new element
     var div = $('#rules')[0],
       row = $('<div>').attr({'class': 'rulerow', id: 'rulerow'+id})
         .html(content);
 
     this.managesieve_insertrow(div, row, after);
 
     // initialize smart list inputs
     $('textarea[data-type="list"]', row).each(function() {
       smart_field_init(this);
     });
 
     this.managesieve_formbuttons(div);
   }
 };
 
 rcube_webmail.prototype.managesieve_ruledel = function(id)
 {
   if ($('#ruledel'+id).hasClass('disabled'))
     return;
 
   this.confirm_dialog(this.get_label('managesieve.ruledeleteconfirm'), 'delete', function(e, ref) {
       var row = document.getElementById('rulerow'+id);
       row.parentNode.removeChild(row);
       ref.managesieve_formbuttons(document.getElementById('rules'));
     });
 };
 
 rcube_webmail.prototype.managesieve_actionadd = function(id)
 {
   this.http_post('plugin.managesieve-action', '_act=actionadd&_aid='+id);
 };
 
 rcube_webmail.prototype.managesieve_actionfill = function(content, id, after)
 {
   if (content != '') {
     var div = $('#actions')[0],
       row = $('<div>').attr({'class': 'actionrow', id: 'actionrow'+id})
         .html(content);
 
     this.managesieve_insertrow(div, row, after);
 
     // initialize smart list inputs
     $('textarea[data-type="list"]', row).each(function() {
       smart_field_init(this);
     });
 
     this.managesieve_formbuttons(div);
   }
 };
 
 rcube_webmail.prototype.managesieve_actiondel = function(id)
 {
   if ($('#actiondel'+id).hasClass('disabled'))
     return;
 
   this.confirm_dialog(this.get_label('managesieve.actiondeleteconfirm'), 'delete', function(e, ref) {
       var row = document.getElementById('actionrow'+id);
       row.parentNode.removeChild(row);
       ref.managesieve_formbuttons(document.getElementById('actions'));
     });
 };
 
 // insert rule/action row in specified place on the list
 rcube_webmail.prototype.managesieve_insertrow = function(div, row, after)
 {
   var node = $('#' + ($(div).attr('id') == 'rules' ? 'rulerow' : 'actionrow')  + after)[0];
 
   if (node)
     $(row).insertAfter(node);
   else
     $(div).append(row);
 
   this.triggerEvent('managesieve.insertrow', {obj: row});
 };
 
 // update Delete buttons status
 rcube_webmail.prototype.managesieve_formbuttons = function(div)
 {
   var buttons = $('a.delete', div);
 
   buttons.removeClass('disabled');
   if (buttons.length == 1)
     buttons.addClass('disabled');
 };
 
 // update vacation addresses field with user identities
 rcube_webmail.prototype.managesieve_vacation_addresses = function(id)
 {
   var lock = this.set_busy(true, 'loading');
   this.http_post('plugin.managesieve-action', {_act: 'addresses', _aid: id}, lock);
 };
 
 // update vacation addresses field with user identities
 rcube_webmail.prototype.managesieve_vacation_addresses_update = function(id, addresses)
 {
   var field = $('#vacation_addresses,#action_addresses' + (id || ''));
   smart_field_reset(field.get(0), addresses);
 };
 
 function rule_header_select(id)
 {
   var is_header,
     obj = document.getElementById('header' + id),
     size = document.getElementById('rule_size' + id),
     spamtest = document.getElementById('rule_spamtest' + id),
     msg = document.getElementById('rule_message' + id),
     op = document.getElementById('rule_op' + id),
     header = document.getElementById('custom_header' + id + '_list'),
     custstr = document.getElementById('custom_var' + id + '_list'),
     mod = document.getElementById('rule_mod' + id),
     trans = document.getElementById('rule_trans' + id),
     comp = document.getElementById('rule_comp' + id),
     mime = document.getElementById('rule_mime' + id),
     mime_part = document.getElementById('rule_mime_part' + id),
     datepart = document.getElementById('rule_date_part' + id),
     dateheader = document.getElementById('rule_date_header_div' + id),
     rule = $('#rule_op' + id),
     h = obj.value,
     set = [op, header, custstr, mod, trans, comp, size, mime, mime_part];
 
   if (h == 'size') {
     if (msg) set.push(msg);
     $.each(set, function() { if (this != window) this.style.display = 'none'; });
     spamtest.style.display = 'none';
     size.style.display = '';
   }
   else if (h == 'spamtest') {
     if (msg) set.push(msg);
     $.each(set, function() { if (this != window) this.style.display = 'none'; });
     spamtest.style.display = '';
     size.style.display = 'none';
   }
   else if (h == 'message' && msg) {
     $.each(set, function() { if (this != window)  this.style.display = 'none'; });
     msg.style.display = '';
   }
   else {
     is_header = h != 'body' && h != 'currentdate' && h != 'date' && h != 'string';
     header.style.display = h != '...' ? 'none' : '';
     custstr.style.display = h != 'string' ? 'none' : '';
     size.style.display = 'none';
     spamtest.style.display = 'none';
     op.style.display = '';
     comp.style.display = '';
     mod.style.display = is_header ? '' : 'none';
     trans.style.display = h == 'body' ? '' : 'none';
     if (mime)
       mime.style.display =  is_header ? '' : 'none';
     if (mime_part)
       mime_part.style.display = is_header ? '' : 'none';
     if (msg)
       msg.style.display = h == 'message' ? '' : 'none';
   }
 
   if (datepart)
     datepart.style.display = h == 'currentdate' || h == 'date' ? 'inline' : 'none';
   if (dateheader)
     dateheader.style.display = h == 'date' ? '' : 'none';
 
   $('[value="exists"],[value="notexists"]', rule).prop('disabled', h == 'string');
   if (!rule.val())
     rule.val('contains');
 
   rule_op_select(op, id, h);
   rule_mod_select(id, h, !is_header);
   rule_mime_select(id);
   rule_spamtest_select(id);
 
   obj.style.width = h == '...' ? '40px' : '';
 };
 
 function rule_op_select(obj, id, header)
 {
   var target = document.getElementById('rule_target' + id + '_list');
 
   if (!header)
     header = document.getElementById('header' + id).value;
 
   target.style.display = obj.value.match(/^(exists|notexists)$/) || header.match(/^(size|spamtest|message)$/) ? 'none' : '';
 };
 
 function rule_trans_select(id)
 {
   var obj = document.getElementById('rule_trans_op' + id),
     target = document.getElementById('rule_trans_type' + id);
 
   target.style.display = obj.value != 'content' ? 'none' : 'inline';
 };
 
 function rule_mod_select(id, header, reset)
 {
   var obj = document.getElementById('rule_mod_op' + id),
     target = document.getElementById('rule_mod_type' + id),
     duplicate = document.getElementById('rule_duplicate_div' + id),
     index = document.getElementById('rule_index_div' + id);
 
   if (reset)
     obj.value = '';
 
   if (!header)
     header = document.getElementById('header' + id).value;
 
   target.style.display = obj.value != 'address' && obj.value != 'envelope' ? 'none' : '';
 
   if (index)
     index.style.display = !header.match(/^(body|currentdate|size|spamtest|message|string)$/) && obj.value != 'envelope'  ? '' : 'none';
 
   if (duplicate)
     duplicate.style.display = header == 'message' ? '' : 'none';
 };
 
 function rule_spamtest_select(id)
 {
   var obj = document.getElementById('rule_spamtest_op' + id),
     target = document.getElementById('rule_spamtest_target' + id);
 
   target.style.display = obj.value ? '' : 'none';
   $(obj)[obj.value ? 'removeClass' : 'addClass']('rounded-right');
 };
 
 function rule_join_radio(value)
 {
   $('#rules').css('display', value == 'any' ? 'none' : 'block');
 };
 
 function rule_adv_switch(id, elem)
 {
   var elem = $(elem), enabled = elem.hasClass('hide'), adv = $('#rule_advanced'+id);
 
   if (enabled) {
     adv.get(0).style.display = 'none';
     elem.removeClass('hide').addClass('show');
   }
   else {
     adv.get(0).style.display = '';
     elem.removeClass('show').addClass('hide');
   }
 };
 
 function rule_mime_select(id)
 {
   var elem = $('#rule_mime_type' + id),
     param_elem = $('#rule_mime_param' + id + '_list');
 
   if (param_elem.length)
     param_elem[0].style.display = elem.val() == 'param' ? '' : 'none';
 };
 
 function action_type_select(id)
 {
   var obj = document.getElementById('action_type' + id),
     v = obj.value, enabled = {},
     elems = {
       mailbox: document.getElementById('action_mailbox' + id),
       target: document.getElementById('redirect_target' + id),
       target_area: document.getElementById('action_target_area' + id),
       flags: document.getElementById('action_flags' + id),
       vacation: document.getElementById('action_vacation' + id),
       forward: document.getElementById('action_forward' + id),
       set: document.getElementById('action_set' + id),
       notify: document.getElementById('action_notify' + id),
       addheader: document.getElementById('action_addheader' + id),
       deleteheader: document.getElementById('action_deleteheader' + id)
     };
 
   if (v == 'fileinto' || v == 'fileinto_copy') {
     enabled.mailbox = 1;
   }
   else if (v == 'redirect' || v == 'redirect_copy') {
     enabled.target = 1;
   }
   else if (v.match(/^reject|ereject$/)) {
     enabled.target_area = 1;
   }
   else if (v.match(/^(add|set|remove)flag$/)) {
     enabled.flags = 1;
   }
   else if (v.match(/^(vacation|forward|set|notify|addheader|deleteheader)$/)) {
     enabled[v] = 1;
   }
 
   for (var x in elems) {
     if (elems[x])
       elems[x].style.display = !enabled[x] ? 'none' : '';
   }
 };
 
 function vacation_action_select()
 {
   var selected = $('#vacation_action').val();
 
   $('#action_target_span')[selected == 'discard' || selected == 'keep' ? 'hide' : 'show']();
 };
 
 // Initializes smart list input
 function smart_field_init(field)
 {
   if (window.UI && UI.smart_field_init)
     return UI.smart_field_init(field);
 
   var id = field.id + '_list',
     area = $('<span class="listarea"></span>'),
     list = field.value ? field.value.split("\n") : [''];
 
   if ($('#'+id).length)
     return;
 
   // add input rows
   $.each(list, function(i, v) {
     area.append(smart_field_row(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('error')) {
     area.addClass('error');
     rcmail.managesieve_tip_register([[id, field.data('tip-class'), field.data('tip-msg')]]);
   }
 };
 
 function smart_field_row(value, idx, field)
 {
   // build row element content
   var input, content = '<span class="listelement">'
       + '<span class="reset"></span><input type="text"></span>',
     elem = $(content),
     attrs = {
       value: value,
       name: field.name + '[]',
       size: $(field).data('size'),
       title: field.title,
       placeholder: $(field).attr('placeholder')
     };
 
   input = elem.find('input').attr(attrs).keydown(function(e) {
     var input = $(this);
 
     // element creation event (on Enter)
     if (e.which == 13) {
       var elem = smart_field_row('', (new Date()).getTime(), field);
 
       input.parent().after(elem);
       $('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 = parent.parent().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
   $('span[class="reset"]', elem).click(function() {
     var span = $(this.parentNode);
 
     if (span.parent().children().length > 1)
       span.remove();
     else
       $('input', span).val('').focus();
   });
 
   return elem;
 }
 
 // Reset and fill the smart list input with new data
 function smart_field_reset(field, data)
 {
   if (window.UI && UI.smart_field_reset)
     return UI.smart_field_reset(field, data);
 
   var id = field.id + '_list',
     list = data.length ? data : [''];
     area = $('#' + id);
 
   area.empty();
 
   // add input rows
   $.each(list, function(i, v) {
     area.append(smart_field_row(v, i, field));
   });
 }
 
 // Register onmouse(leave/enter) events for tips on specified form element
 rcube_webmail.prototype.managesieve_tip_register = function(tips)
 {
   if (window.UI && UI.form_errors)
     return UI.form_errors(tips);
 
   var n, framed = parent.rcmail,
     tip = framed ? parent.rcmail.env.ms_tip_layer : rcmail.env.ms_tip_layer;
 
   for (n in tips) {
     $('#'+tips[n][0])
       .data('tip-class', tips[n][1])
       .data('tip-msg', tips[n][2])
       .mouseleave(function(e) { tip.hide(); })
       .mouseenter(function(e) {
         var elem = $(this),
           offset = elem.offset(),
           left = offset.left,
           top = offset.top - 12,
           minwidth = elem.width(),
           span = $('<span>').addClass(elem.data('tip-class')).text(elem.data('tip-msg'));
 
         if (framed) {
           offset = $((rcmail.env.task == 'mail'  ? '#sievefilterform > iframe' : '#filter-box'), parent.document).offset();
           top  += offset.top;
           left += offset.left;
         }
 
         tip.html('').append(span);
         top -= tip.height();
 
         tip.css({left: left, top: top, minWidth: (minwidth-2) + 'px'}).show();
       });
   }
 };
 
 // format time string
 function sieve_formattime(hour, minutes)
 {
   var i, c, h, time = '', format = rcmail.env.time_format || 'H:i';
 
   for (i=0; i<format.length; i++) {
     c = format.charAt(i);
     switch (c) {
       case 'a': time += hour >= 12 ? 'pm' : 'am'; break;
       case 'A': time += hour >= 12 ? 'PM' : 'AM'; break;
       case 'g':
       case 'h':
         h = hour == 0 ? 12 : hour > 12 ? hour - 12 : hour;
         time += (c == 'h' && hour < 10 ? '0' : '') + hour;
         break;
       case 'G': time += hour; break;
       case 'H': time += (hour < 10 ? '0' : '') + hour; break;
       case 'i': time += (minutes < 10 ? '0' : '') + minutes; break;
       case 's': time += '00';
       default: time += c;
     }
   }
 
   return time;
 }
 
 function sieve_form_init()
 {
   var form = rcmail.gui_objects.sieveform;
 
   // resize dialog window
   if (rcmail.env.action == 'plugin.managesieve' && rcmail.env.task == 'mail') {
     parent.rcmail.managesieve_dialog_resize(form);
   }
 
   $('input[type="text"]', form).first().focus();
 
   // initialize smart list inputs
   $('textarea[data-type="list"]', form).each(function() {
     smart_field_init(this);
   });
 
   // initialize rules form(s)
   $('[name^="_header"]', form).each(function() {
     if (/([0-9]+)$/.test(this.id)) {
       rule_header_select(RegExp.$1);
     }
   });
 
   // enable date pickers on date fields
   if ($.datepicker && rcmail.env.date_format) {
     $.datepicker.setDefaults({
       dateFormat: rcmail.env.date_format,
       changeMonth: true,
       showOtherMonths: true,
       selectOtherMonths: true,
       onSelect: function(dateText) { $(this).focus().val(dateText); }
     });
     $('input.datepicker').datepicker();
   }
 
   // configure drop-down menu on time input fields based on jquery UI autocomplete
   $('#vacation_timefrom, #vacation_timeto')
     .attr('autocomplete', "off")
     .autocomplete({
       delay: 100,
       minLength: 1,
       source: function(p, callback) {
         var h, result = [];
         for (h = 0; h < 24; h++)
           result.push(sieve_formattime(h, 0));
         result.push(sieve_formattime(23, 59));
 
         return callback(result);
       },
       open: function(event, ui) {
         // scroll to current time
         var $this = $(this), val = $this.val(),
           widget = $this.autocomplete('widget').css('width', '10em'),
           menu = $this.data('ui-autocomplete').menu;
 
         if (val && val.length)
           widget.children().each(function() {
             var li = $(this);
             if (li.text().indexOf(val) == 0)
               menu._scrollIntoView(li);
           });
       },
       select: function(event, ui) {
         $(this).val(ui.item.value);
         return false;
       }
     })
     .click(function() {  // show drop-down upon clicks
       $(this).autocomplete('search', $(this).val() || ' ');
     })
 
   // display advanced controls when contain errors
   $('input.error').each(function() {
     if (String(this.id).match(/([0-9]+)$/)) {
       $('#ruleadv' + RegExp.$1 + '.show').click();
     }
   });
 }
 
 /*********************************************************/
 /*********        RAW editor methods             *********/
 /*********************************************************/
 
 var cmeditor;
 
 function cmCreateErrorElem(msg)
 {
   var marker = document.createElement("div");
   marker.style.color = "#822";
   marker.innerHTML = "●";
   marker.title = msg;
 
   return marker;
 }
 
 function cmScrollToError()
 {
   var line = $('.CodeMirror-lines .line-error'),
     scroll = $('.CodeMirror-scroll'),
     h = line.parent();
 
   scroll.scrollTop(line.offset().top - scroll.offset().top - Math.round(scroll.height()/2));
 }
 
 function sieve_raw_editor_init()
 {
   var textArea = document.getElementById('rawfiltersettxt');
   if (textArea && !cmeditor) {
     cmeditor = CodeMirror.fromTextArea(textArea, {
       mode: 'sieve',
       lineNumbers: true,
       gutters: ["CodeMirror-linenumbers", "errorGutter"],
       styleActiveLine: true
     });
 
     // fetching errors from environment and setting the line background
     // and a gutter element with the error message accordingly
     $.each(rcmail.env.sieve_errors || [], function(i, err) {
       var lineNo = Number(err.line) - 1;
       cmeditor.addLineClass(lineNo, 'background', 'line-error');
       cmeditor.setGutterMarker(lineNo, 'errorGutter', cmCreateErrorElem(err.msg));
       if (!i) cmScrollToError();
     });
   }
 }
 
 
 /*********************************************************/
 /*********           Mail UI methods             *********/
 /*********************************************************/
 
 rcube_webmail.prototype.managesieve_create = function(force)
 {
   if (!force && this.env.action != 'show') {
     var uid = this.message_list.get_single_selection(),
       lock = this.set_busy(true, 'loading');
 
     this.http_post('plugin.managesieve-action', {_uid: uid}, lock);
     return;
   }
 
   if (!this.env.sieve_headers || !this.env.sieve_headers.length)
     return;
 
   var i, buttons = {},
     title = this.get_label('managesieve.newfilter'),
     dialog = $('<div id="sievefilterform" class="propform"></div>'),
     props = {minWidth: 600, minHeight: 250, height: 300};
 
 
   // build dialog window content
   dialog.append($('<fieldset>')
     .append($('<legend>').text(this.get_label('managesieve.usedata')))
     .append($('<ul class="proplist">'))
   );
 
   $.each(this.env.sieve_headers, function(i, v) {
     var attr = {type: 'checkbox', name: 'headers[]', id: 'sievehdr' + i, value: i,  checked: true},
       label = rcmail.env.sieve_headers[i][0] + ': ' + rcmail.env.sieve_headers[i][1];
 
     $('ul', dialog).append($('<li>')
       .append($('<input>').attr(attr))
       .append($('<label>').attr('for', 'sievehdr' + i).text(label))
     );
   });
 
   // [Next Step] button action
   buttons[this.get_label('managesieve.nextstep')] = function () {
     // check if there's at least one checkbox checked
     var hdrs = $('input[name="headers[]"]:checked', dialog);
     if (!hdrs.length) {
       rcmail.alert_dialog(rcmail.get_label('managesieve.nodata'));
       return;
     }
 
     // build frame URL
     var url = rcmail.get_task_url('mail');
     url = rcmail.add_url(url, '_action', 'plugin.managesieve');
     url = rcmail.add_url(url, '_framed', 1);
 
     hdrs.map(function() {
       var val = rcmail.env.sieve_headers[this.value];
       url = rcmail.add_url(url, 'r['+this.value+']', val[0]+':'+val[1]);
     });
 
     // load form in the iframe
     var buttons = {}, iframe = $('<iframe>').attr({src: url, frameborder: 0});
 
     // Change [Next Step] button with [Save] button
     buttons[rcmail.get_label('save')] = function() {
       var win = $('iframe', dialog).get(0).contentWindow;
       win.rcmail.managesieve_save();
     };
     buttons[rcmail.get_label('cancel')] = function() { $(this).dialog('destroy'); };
 
     dialog.dialog('destroy');
 
     rcmail.env.managesieve_dialog = dialog = rcmail.show_popup_dialog(
       iframe, title, buttons, $.extend(props, {button_classes: ['mainaction save', 'cancel']})
     );
   };
 
   buttons[this.get_label('cancel')] = function() { $(this).dialog('destroy'); };
 
   this.env.managesieve_dialog = dialog = this.show_popup_dialog(
     dialog, title, buttons, $.extend(props, {button_classes: ['mainaction next', 'cancel']})
   );
 }
 
 rcube_webmail.prototype.managesieve_dialog_close = function()
 {
   this.env.managesieve_dialog.dialog('destroy');
 }
 
 rcube_webmail.prototype.managesieve_dialog_resize = function(o)
 {
   var dialog = this.env.managesieve_dialog,
     win = $(window), form = $(o);
     width = $('fieldset', o).first().width(), // fieldset width is more appropriate here
     height = form.height(),
     w = win.width(), h = win.height();
 
   if (height < 100)
     return;
 
   dialog.dialog('option', { height: Math.min(h-20, height+120), width: Math.min(w-20, width+65) });
 }