Fix default sorting of threaded list when THREAD=REFS isn't supported.
The result need to be re-sorted even if sort column is not set. This fixes
the issue when new messages aren't displayed on top of the list.
Fix thread cache syncronization/validation (#1489028)
Fix typos in sql queries of garbage collector (expired -> expires)
Set TTL for attachments stored in sql database
Use rcube_cache class to store attachments in database.
Add options to configure TTL and cache type.
Fix timeout issue on drag&drop uploads (#1489170)
Set minimum height for message headers block (#1489108)
Add styles for image thumbnails in print mode (#1489134)
Added section for upcoming 0.9.2 release