microsoft / microsoft/microsoft-ui-xaml

Backdrop on CoreWindow is broken on Windows App SDK 1.7

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bug needs-triage
Dominant language
C++
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Forks
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Avg merge
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Merged PRs (30d)
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Description

Describe the bug

The backdrop is broken on CoreWindow. It only shows accent color now.
Image
It works fine on Windows App SDK 1.6. I know the support for CoreWindow is hidden on Windows App SDK. But it's indeed a bug.

Steps to reproduce the bug
  1. Using MicaController or DesktopAcrylicController to add backdrop for Window
  2. The backdrop is not set correctly
Expected behavior

Same as before.
Image

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.7.3: 1.7.250606001

Windows version

Windows 11 (24H2): Build 26100

Additional context

No response

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the issue with CoreWindow on Windows App SDK 1.7.3 using MicaController and DesktopAcrylicController, then compare the result with SDK 1.6. Trace the CoreWindow backdrop path to identify why only the accent color appears. Done means the backdrop renders as it did on 1.6 on Windows 11 24H2.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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