--- placement.c.0	2013-05-05 11:58:42.000000000 -0400
+++ placement.c	2014-07-31 22:13:19.089240458 -0400
@@ -117,8 +117,9 @@
         if (FLAG_TEST (c2->flags, CLIENT_FLAG_HAS_STRUT)
             && FLAG_TEST (c2->xfwm_flags, XFWM_FLAG_VISIBLE))
         {
-            screen_width = c2->screen_info->width;
-            screen_height = c2->screen_info->height;
+            /* actual X11 screen size (not screen_info->width/height) */
+            screen_width = gdk_screen_get_width (c2->screen_info->gscr);
+            screen_height = gdk_screen_get_height (c2->screen_info->gscr);
 
             /* Left */
             if (overlap (*x, *y, *x + *w, *y + *h,