THREADS
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THREADS
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	* Current status of THREADS implementation *


	CHANGES IN RELATION TO ORIGINAL PATCH
	- don't add nested messages into selection on collapse if parent message
	is in selection
	- some changes in messages highlighting
	- re-written all changes in rcube_imap.php
	- temporary removed threads caching (see TODO)
	- use depth=0 for roots
	- thread expand state is not stored anywhere
	- removed imap_thread_algorithm option, we're using the best algorithm
	supported by server and implement REFS sorting in Roundcube
	- use underlined subject for root with unread children (icon is still supported)
	- on deleting messages the whole list isn't refreshed
	- added 'expand unread' button

	TODO (must have):
	- threads caching
	- updating threaded message list on message delete
	- don't reload messages list on check_recent

	KNOWN ISSUES:
	- on new message (check_recent) the whole list is reloaded
	- css issues on IE6

	TODO (other):
	- performance: fetching all messages for list in "expand all" state only,
	if "expand all" is disabled we should fetch only root messages and fetch
	children on-demand (on expand button click),
	Notice: this is not so simple, because we need to fetch children
	to set "unread_children", but we can fetch only flags instead of
	all headers for each child
	- button in #listcontrols to mark all messages in current thread (with selected
	root or child message),
	- icons for thread tree structure

	TODO (by the way):
	- use jQuery.inArray instead of find_in_array() (common.js)