Gnome-terminal crashes with drag-drop of text in find option menu and space bar is simultaneously pressed.

Issue

• Crash in gtk_entry_drag_gesture_update
• gnome-terminal crashes when text is entered in find menu option, selected text is drag-dropped and space bar is pressed simultaneously.

• Backtrace similar to following is generated from coredump :

  4702              gtk_entry_get_pixel_ranges (entry, &ranges, &n_ranges);
  4703    
  4704              button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
  4705              gtk_drag_begin_with_coordinates (widget, target_list, actions,
  4706                                               button, (GdkEvent*) event,
  4707                                               priv->drag_start_x + ranges[0],
  4708                                               priv->drag_start_y);
  4709              g_free (ranges);