Re: [PATCH v3 0/2] MR10324: win32u: Fix deadlock when setting hdc_src to the window's self DC.

[Zhao Yi (＠Zhaoyi)]

On Tue Mar 24 16:49:37 2026 +0000, Rémi Bernon wrote:
> Okay, but what is UpdateLayeredWindow supposed to do if src / dst rect
> are overlapping? It may return success but does it blit anything?
> According to the MSDN introduction for the function UpdateLayeredWindow, it states: "_If the shape and visual context of the window are not changing, hdcSrc can be NULL._" (link:https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-updat...), Based on this, I think that when the src and dst are the same, there is no need to blit anything.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/10324#note_133708