Fix crashes and other bugs on LessTif

* lwlib/lwlib-Xm.c (make_menu_in_widget): XmIsRowColumn is
broken on the latest LessTif release, so avoid that here.
* src/xfns.c (x_window): Add PropertyChangeMask which LessTif
doesn't do itself.

lwlib/lwlib-Xm.c

@@ -496,9 +496,11 @@ make_menu_in_widget (widget_instance* instance,
     ;
   children = (Widget*)(void*)XtMalloc (num_children * sizeof (Widget));
 
+#ifndef LESSTIF_VERSION
   /* WIDGET should be a RowColumn.  */
   if (!XmIsRowColumn (widget))
     emacs_abort ();
+#endif
 
   /* Determine whether WIDGET is a menu bar.  */
   type = -1;

src/xfns.c

@@ -3803,8 +3803,13 @@ x_window (struct frame *f, long window_prompting)
 		   FRAME_DISPLAY_INFO (f)->Xatom_wm_protocols,
 		   XA_ATOM, 32, PropModeAppend, NULL, 0);
 
+#if !defined USE_MOTIF || !defined HAVE_XINPUT2
   /* Make all the standard events reach the Emacs frame.  */
   attributes.event_mask = STANDARD_EVENT_SET;
+#else
+  /* This is used for Motif menus.  */
+  attributes.event_mask = STANDARD_EVENT_SET | PropertyChangeMask;
+#endif
 
 #ifdef HAVE_X_I18N
   if (FRAME_XIC (f))