user32: Don't paint to the surface if the window has a pixel format, regardless…

dlls/user32/painting.c

@@ -113,6 +113,7 @@ static void update_visible_region( struct dce *dce )
     HRGN vis_rgn = 0;
     HWND top_win = 0;
     DWORD flags = dce->flags;
+    DWORD paint_flags = 0;
     size_t size = 256;
     RECT win_rect, top_rect;
     WND *win;
@@ -149,6 +150,7 @@ static void update_visible_region( struct dce *dce )
                 top_rect.top    = reply->top_rect.top;
                 top_rect.right  = reply->top_rect.right;
                 top_rect.bottom = reply->top_rect.bottom;
+                paint_flags     = reply->paint_flags;
             }
             else size = reply->total_size;
         }
@@ -163,12 +165,16 @@ static void update_visible_region( struct dce *dce )
     if (dce->clip_rgn) CombineRgn( vis_rgn, vis_rgn, dce->clip_rgn,
                                    (flags & DCX_INTERSECTRGN) ? RGN_AND : RGN_DIFF );
 
-    if ((win = WIN_GetPtr( top_win )) && win != WND_DESKTOP && win != WND_OTHER_PROCESS)
+    /* don't use a surface to paint the client area of OpenGL windows */
+    if (!(paint_flags & SET_WINPOS_PIXEL_FORMAT) || (flags & DCX_WINDOW))
     {
-        /* don't use a surface to paint the client area of OpenGL windows */
-        if (!win->pixel_format || (flags & DCX_WINDOW)) surface = win->surface;
-        if (surface) window_surface_add_ref( surface );
-        WIN_ReleasePtr( win );
+        win = WIN_GetPtr( top_win );
+        if (win && win != WND_DESKTOP && win != WND_OTHER_PROCESS)
+        {
+            surface = win->surface;
+            if (surface) window_surface_add_ref( surface );
+            WIN_ReleasePtr( win );
+        }
     }
 
     if (!surface) top_rect = get_virtual_screen_rect();