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roundcubemail/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)