[PATCH v5 0/5] MR9578: win32u: Ignore statup cmd show mode for owned windows.

[Paul Gofman (＠gofman)]

Fixes a regression introduced by 8d7de32cd646f3d1f118836e643e6146c9837278.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=59034

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  v5: win32u: Clear STARTF_USESHOWWINDOW in MessageBoxIndirectW().
      user32/tests: Add tests showing that MessageBox() resets STARTF_USESHOWWINDOW.
      win32u: Implement NtUserModifyUserStartupInfoFlags().
      win32u: Fetch startup info flags during initialization.
      win32u: Ignore statup cmd show mode for owned windows.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/9578