[Windows] Fix TitleBar.IsVisible = false the caption buttons become unresponsive #33256
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This was referenced Dec 22, 2025
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Issue Details
On Windows, when TitleBar.IsVisible is set to false, the system caption buttons (minimize, maximize, close) become unresponsive after resizing the window.
Description of Change
Updated WindowRootView.UpdateTitleBarContentSize() to apply passthrough regions only when the TitleBar is visible and to clear them when it is hidden, preventing stale regions from blocking caption button interactions.
Issues Fixed
Fixes #33171
Tested the behavior in the following platforms.
After.mov
Before.mov