[PATCH 0/1] MR6400: user32/test: Test UpdateLayeredWindow with alpha-blending

[Matthias Schwarzott (＠zzam)]

UpdateLayeredWindow with alpha-blending does not show correct colors.
Calling it with hdc_src=NULL does nothing (in contrast to windows).

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6400