diff --git "a/win32ss/user/ntuser/winpos.c" "b/win32ss/user/ntuser/winpos.c"
index 1fb5bda74af..311a6d26fc8 100644
--- "a/win32ss/user/ntuser/winpos.c"
+++ "b/win32ss/user/ntuser/winpos.c"
@@ -2023,7 +2023,9 @@ co_WinPosSetWindowPos(
       Window->state |= WNDS_SENDNCPAINT;
    }
 
-   if (!(WinPos.flags & SWP_NOREDRAW) && ((WinPos.flags & SWP_AGG_STATUSFLAGS) != SWP_AGG_NOPOSCHANGE))
+   if ((!(WinPos.flags & SWP_NOREDRAW) && ((WinPos.flags &
+       SWP_AGG_STATUSFLAGS) != SWP_AGG_NOPOSCHANGE)) ||
+       ((WinPos.flags & SWP_NOZORDER) && (WinPos.flags & SWP_NOOWNERZORDER))) //  See CORE-19912
    {
       /* Determine the new visible region */
       VisAfter = VIS_ComputeVisibleRegion(Window, FALSE, FALSE,