Improve background color code for URL Navigator and adjacent fullscreen toolbars
Similar to D10781: Replace manual palette adjustment with background role (fullscreen info label), modifying background role to get a dark background instead of
manually adjusting palette is a preferred solution. This way the palette is still
inherited so does not need to be continually adjusted when the overall palette
changes, like when switching to/from fullscreen.
This also makes the entire fullscreen toolbar (including URL nav) have a consistent background color
Fullscreen left edge before:
Fullscreen left edge after:
Fullscreen right edge before:
Fullscreen right edge after:
In Browse, the URL Navigator should have a darker background color than the rest of the UI.
In Fullscreen Browse, the entire toolbar should have a consistent, dark, background color.
Reviewers: Gwenview, rkflx, ngraham
Reviewed By: Gwenview, rkflx, ngraham
Differential Revision: https://phabricator.kde.org/D10880