ContentDonUnload should be fired by all editables when they are detached.
Changelog entries.
Merge branch 't/11131b'
Makes code more readable and ready to future changes.
Check id offset == container.length before enlarge end.
Check whitespaces using walker instead of regexp.
Removed unneeded condition from walker.guard.
Compile regexp.
Added comment to onlyWhiteSpaces.
Re-used the regex.
Changelog entry.
Merge branch 't/10778'
Fixed widgets drag handler duplication issue.
Early return for non-draggable widget.
Restructured setupDragHandler() function so it will also apply mousedown/dragstart listener on image when handler already exists.
Reuse mask if already exists.
Changelog entry.
Merge branch 't/11281b'
Fix for IE loading preview in QM.
Changelog entries.