Revert "panel-toplevel: Remove pointer boundary check in panel_toplevel_queue_auto_hide()"

This reverts commit 0d29acf.

Which causes a regression.
Fixes #773

Author: raveit65

mate-panel/panel-toplevel.c

@@ -3805,6 +3805,7 @@ panel_toplevel_queue_auto_hide (PanelToplevel *toplevel)
 	g_return_if_fail (PANEL_IS_TOPLEVEL (toplevel));
 
 	if (!toplevel->priv->auto_hide ||
+	    panel_toplevel_contains_pointer (toplevel) ||
 	    panel_toplevel_get_autohide_disabled (toplevel))
 	  return;