Made dom.element#addClass chainable.
Changelog entry.
Merge branch 't/11872'
Fixed: parts#link discovered badly if upcasting existing widget (i.e. paste).
Changelog entry.
Merge branch 't/11813'
Fixed: Link and unlink entries persistently displayed in Image2 context menu regardles of linked state.
Changelog entry.
Merge branch 't/11814'
Focus sourcearea after resizing, because otherwise caret ends in editor's UI.
Changelog entry.
Merge branch 't/11839'
Reset border which old IEs applies by default to linked images.
Changelog entry.
Merge branch 't/11880'
ProtectedSource markup should not be applied to elements like title, textarea, iframe.
Use simple concatenation.
Changelog entry.
Merge branch 't/11223'
Use editable instead of document for mousemove on IE8.