[Bug 57072] New: Window is flashing when painting transluent effects

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57072

Bug ID: 57072
           Summary: Window is flashing when painting transluent effects
           Product: Wine
           Version: 9.15
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 46c8a637525d0f1cf67830295fb460c819b800b6
      Distribution: ---

An application that I have here draws transluent effects when mouse moves over
some of its text items and that leads to huge flashing. It looks like top level
window is constantly recreated. This is a regression caused by

commit 46c8a637525d0f1cf67830295fb460c819b800b6
Author: Elizabeth Figura 
Date:   Fri Jan 20 16:23:42 2023 -0600

winex11: Separately store the internal pixel format set by
WGL_WINE_pixel_format_passthrough.

Reverting just single line of this commit

@@ -1402,12 +1402,12 @@ static BOOL set_win_format( HWND hwnd, const struct
wgl_
pixel_format *format, BO
     XFlush( gdi_display );
     release_gl_drawable( gl );

-    win32u_set_window_pixel_format( hwnd, pixel_format_index( format ), FALSE
)
;
+    win32u_set_window_pixel_format( hwnd, pixel_format_index( format ),
interna
l );

completely fixes the problem. Could that be an inadvertent change or oversight?