Add side borders to toolbars
Like most other container "bar" widgets, such as actionbar
, headerbar
,
menubar
, infobar
and searchbar
, .toolbar
should have its own side border
to separate it from the main content.
See !1728 (comment 775195) for the background.
This merge requests also fixes some broken relationships between frames and toolbars in demos and paperdialog.
Edited by nana-4