Draft: win32u: Reset surface clip region if it matches the visible rect.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57665
With an empty clipping region, when the window is being shown, the Expose event we receive is ignored by expose_window_surface
, assuming there's no redraw necessary. If a clipping region is set, we call NtUserRedrawWindow
with RDW_ERASE
which clears the window.