Added clipboard plugin as a dependency of widgets since it's needed to drag and drop widget instances.
Upper-cased Image2 and Language button names.
Added a note to Changelog about renamed Image2 and Language buttons.
Fixed: Buggy discovery of image dimensions when changing src in IE9/10.
Changelog entry.
Merge branch 't/11159'
Fixed: Widget drag handler is not fully visible when inline widget is in a heading.
Changelog entry.
Merge branch 't/11198'
Fixed code style issues.
Removed unnecessary code for old Opera.
Docs.
Merge branch 't/11114-initial-cleanup'
Delay any selection movement after drop, so it won't disappear on FF.
Changelog entry.
Merge branch 't/11132'
QM in IE10+ should be handled as standards mode.
Improved env#quirks docs.
Changelog entry.
Merge branch 't/11182'