Use a RowLayout for laying out ToolBarPageHeader
This uses RowLayout to perform the layout of ToolBarPageHeader. It uses
the titleDelegate's Layout properties to control the layout of the Title
Run Kirigami Gallery.
All pages behave correctly regarding titles:
- Default view shows title + as many actions as fit into the window
- Resizing the window shows the actions disappearing until only the context action is left, after which the title starts eliding.
- Resizing back to a large size first un-elides the title, then immediately the actions start to appear again.
Reviewers: Kirigami, leinir, mart
Reviewed By: Kirigami, leinir, mart
Subscribers: leinir, plasma-devel
Differential Revision: https://phabricator.kde.org/D25141