[PATCH 0/1] MR7141: winex11: Always blit offscreen over any other onscreen clients.

[Rémi Bernon (＠rbernon)]

Since we're checking the child window clipping rules it is possible
that a toplevel window also has an onscreen client window, for instance
if the window wasn't created with WS_CLIPCHILDREN. The last window to
present between the parent and its children should be visible.

GDI blits always happen over the toplevel window, and we need to use
IncludeInferiors to make sure it goes through any onscreen client window
that is otherwise hiding the toplevel pixels.

It should be safe to use that flag wrt other child windows, as we also
set the clipping region to exclude the area that should be obscured by
any sibling.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57661