Rémi Bernon (@rbernon) commented about dlls/win32u/dce.c:
top_win = wine_server_ptr_handle( reply->top_win ); win_rect = wine_server_get_rect( reply->win_rect ); top_rect = wine_server_get_rect( reply->top_rect );
if (flags & DCX_PARENTCLIP){win_rect.right = top_rect.right;win_rect.bottom = top_rect.bottom;}
This doesn't look right, why only the right / bottom coordinates?