fix(macos): prevent title bar flash on fullscreen exit - #22101
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MrJul merged 1 commit intoSep 1, 2026
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- Restore title bar transparency before AppKit begins the exit animation for windows with an extended client area.
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This matches the logic we already have elsewhere for extended mode.
Tested, it works as expected.
LGTM!
MrJul
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What does the pull request do?
Prevents the native macOS title bar from briefly appearing when an extended-client-area window exits fullscreen.
I noticed this behavior while investigating #21119.
What is the current behavior?
On macOS, a window using
ExtendClientAreaToDecorationsHint="True"withWindowDecorations="Full"can briefly display the opaque native title bar when exiting fullscreen.This is especially noticeable when the extended client area is used to render a custom title bar. The flash disappears once Avalonia restores the transparent title bar after the transition.
12.1.1.mp4
What is the updated/expected behavior with this PR?
999.mp4
How was the solution implemented (if it's not obvious)?
None.
Checklist
Breaking changes
None.
Obsoletions / Deprecations
None.
Fixed issues
None.