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WinUI 3 Preview 2 Blur Brush Bug Around Window Border

This repo reproduces a bug in WinUI 3 Preview 2 where Win2D blur brush around window border has a gradient masked effect. To prove uwp doesn't have this bug a uwp project with the exact same code is also included.

Folder structure:

  • BlurBrushTestUwp: This is the control project: UWP doesn't have this bug.
  • BlurBrushTestWinUI3Preview2Uwp: This is the WinUI 3 Preview 2 project which can reproduce the bug.

Note: The bug appears in WinUI regardless of effect border mode/sprite visual border mode. In UWP, the blur works fine regardless of either mode as well.

Steps to reproduce

  1. Build the project in BlurBrushTestWinUI3Preview2Uwp.
  2. Observe blur around the window border has a gradient masked effect.

Expected Result

WinUI blur brush is the same as UWP blur brush.

Actual Result

WinUI blur brush has a weird masked gradient effect around window border.

Version Windows 10 2004

Screenshots

UWP:

WinUI 3 Preview 2

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