--- a/gedit/gedit-app.c	2016-09-20 12:06:27.000000000 +0200
+++ b/gedit/gedit-app.c	2016-09-20 12:11:09.196007270 +0200
@@ -324,6 +324,7 @@
 	gint sc_width, sc_height;
 	gint x, y, width, height;
 	gint vp_x, vp_y;
+        gint window_center_x, window_center_y;
 
 	/* Check for screen and display match */
 	display = gdk_screen_get_display (screen);
@@ -353,16 +354,16 @@
 	width = gdk_window_get_width (gdkwindow);
 	height = gdk_window_get_height (gdkwindow);
 	gedit_utils_get_current_viewport (screen, &vp_x, &vp_y);
-	x += vp_x;
-	y += vp_y;
+        window_center_x = x + vp_x + width * .5;
+        window_center_y = y + vp_y + height * .5;
 
 	sc_width = gdk_screen_get_width (screen);
 	sc_height = gdk_screen_get_height (screen);
-
-	return x + width * .25 >= viewport_x &&
-	       x + width * .75 <= viewport_x + sc_width &&
-	       y >= viewport_y &&
-	       y + height <= viewport_y + sc_height;
+        /* use window center so any symmetrical shadow additions can be ignored*/
+	return window_center_x >= viewport_x &&
+	       window_center_x <= viewport_x + sc_width &&
+	       window_center_y >= viewport_y &&
+	       window_center_y <= viewport_y + sc_height;
 }