Add "EGL_ANGLE_flexible_surface_compatibility" ext check #13080
Merged
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What does the pull request do?
Extension check that fixes Avalonia compatibility with newer Angle versions.
"EGL_ANGLE_flexible_surface_compatibility" extension was removed somewhere after 2020 angle releases, while Avalonia still used it.
How was the solution implemented (if it's not obvious)?
We could remove this attribute and upgrade Angle to the newest, but to keep compatibility with older native binaries, an extension check was added.
Also, as this code is reused between normal Angle and DXGI, some code was reused.
Fixes
Probably fixes #10405 (comment) specific comment. And also possibly fixes Angle on ARM64, when used with newer builds (Edge builds for example).