Support allowfullscreen attribute on iframe elements
Replace hint about the default skin
Skip redundant prepare_for_export() calls
Fix drag-n-drop after folder move/create (#1489648)
Create/rename groups in UI dialogs (#1489951)
Handle clicks on list parent element from the list widget
Remove useless css rules
Set 'compose_extwin' env property on every step; accept a list of URL parameters for the 'compose' command
Fix missing css/js scripts in filter form in mail task
Merge branch 'master' of github.com:roundcube/roundcubemail
Fix bug where $Forwarded flag was being set even if server didn't support it (#1490000)