[PATCH v2 0/2] MR1081: win32u: Reject invalid length in SetWindowPlacement.

[Esme Povirk (＠madewokherd)]

This change has been in Proton to fix a bug in the DayZ launcher.

The launcher is a .NET application that, best I can tell, contains marshaling code that calls SetWindowPlacement incorrectly. This results in undefined memory being passed in and broken values returned by GetWindowPlacement. I think the value passed in must be broken on Windows, but as the tests show, Windows rejects SetWindowPlacement calls that don't have length set correctly (but not GetWindowPlacement, as zeroing the structure to give it an invalid length in `other_process_proc` shows).

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  v2: win32u: Reject invalid length in SetWindowPlacement.
      user32: Test Get/SetWindowPlacement with invalid length.

https://gitlab.winehq.org/wine/wine/-/merge_requests/1081