Add a resource for title bar background - #21440
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What does the pull request do?
This PR partly reverts #21354 by re-introducing an opaque brush for the title bar by default. The window's background stays transparent, though.
To make it easy to alter the title bar's background, a new resource
TitleBarBackgroundBrushis introduced in the fluent theme.What is the current behavior?
On X11, with
ForceDrawnDecorations = trueenabled andExtendClientAreaToDecorationsHint = false, the title bar is incorrectly transparent.What is the updated/expected behavior with this PR?
The title bar has a proper color.