[release/10.0] Fix Fluent in Windows 10 #11342
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Fixes #11277
Description
The default window background is transparent, and backdrop material is applied to the window based on the developer’s preference. However, Windows 10 does not support backdrop materials, which results in incorrect window rendering and leads to a arid Fluent experience.
This change overrides the default window background value based on the selected backdrop preference and the OS the application is running on. Additionally, it listens for HC theme changes, since backdrop materials should not be applied when HC themes are enabled.
Customer Impact
Users will be able to seamlessly use Fluent‑themed applications on Windows 10, while developers retain the ability to use backdrop materials on Windows 11 without compromise.
Regression
Yes
Testing
Local Build Pass
Tested the changes in original PR manually on Windows 10.
Risk
Low, fixes of similar kind are already in release/9.0 branch.
Microsoft Reviewers: Open in CodeFlow