This patch comes from sawfish-mmc. Without it, opening
a menu in KDE deactivates the current window.

--- sawfish/src/events.c
+++ sawfish/src/events.c
@@ -955,11 +955,15 @@
     Lisp_Window *w = find_window_by_id (ev->xfocus.window);
     if (ev->xfocus.detail == NotifyPointer)
 	return;
+    if (ev->xfocus.mode == NotifyGrab || ev->xfocus.mode == NotifyUngrab)
+	return;
     if (w != 0 && ev->xfocus.detail != NotifyInferior)
     {
 	if (focus_window == w)
 	{
-	    focus_window = 0;
+	    if (ev->xfocus.mode == NotifyNormal || ev->xfocus.mode == NotifyWhileGrabbed)
+		focus_window = 0;
+
 	    report_focus_change (w);
 	}