Added missing requirement in docprops plugin.
Changelog entry.
Merge branch 't/11717'
Reverted 2cf790ed.
Block default actions of undo/redo keystrokes only in wysiwyg mode.
Changelog entry about adding showborders to standard preset.
Introduced filter.addElementCallback method.
Changelog entry.
Merge branch 't/11737' into major
Changelog entry.
Merge branch 't/11677'
Merge branch 'master' into major
Link Plugin integration: Link dialog opened if double-clicked linked image.
Link Plugin integration: Handle link and unlink commands refresh in Image2.
Link Plugin integration: Integrate only when plugin is loaded.
Registered link in widget parts.
Upcast links containing images.
Defined new state change: link.
Code refactoring: renamed internal methods of state shifter.
Code refactoring: Moved inflate and deflate out of data function to avoid re-definion with every single data call.