=== modified file 'src/gtkutil.c'
--- src/gtkutil.c	2014-07-27 13:21:30 +0000
+++ src/gtkutil.c	2014-07-31 14:17:38 +0000
@@ -3656,6 +3656,8 @@
   gtk_fixed_put (GTK_FIXED (f->output_data.x->edit_widget), webox, -1, -1);
   gtk_container_add (GTK_CONTAINER (webox), wscroll);
 
+  /* Make event box invisible to avoid display artifacts.  */
+  gtk_event_box_set_visible_window (GTK_EVENT_BOX (webox), FALSE);
 
   /* Set the cursor to an arrow.  */
   xg_set_cursor (webox, FRAME_DISPLAY_INFO (f)->xg_cursor);
@@ -3723,6 +3725,8 @@
   gtk_fixed_put (GTK_FIXED (f->output_data.x->edit_widget), webox, -1, -1);
   gtk_container_add (GTK_CONTAINER (webox), wscroll);
 
+  /* Make event box invisible to avoid display artifacts.  */
+  gtk_event_box_set_visible_window (GTK_EVENT_BOX (webox), FALSE);
 
   /* Set the cursor to an arrow.  */
   xg_set_cursor (webox, FRAME_DISPLAY_INFO (f)->xg_cursor);