layout_changed

The layout_changed signal is emitted each time a layout manager has been changed.

Every Actor using the manager instance as a layout manager should connect a handler to the layout_changed signal and queue a relayout on themselves:

	static void layout_changed (ClutterLayoutManager *manager,
															ClutterActor				 *self)
	{
		clutter_actor_queue_relayout (self);
	}
	...
		self->manager = g_object_ref_sink (manager);
		g_signal_connect (self->manager, "layout-changed",
											G_CALLBACK (layout_changed),
											self);

Sub-classes of LayoutManager that implement a layout that can be controlled or changed using parameters should emit the layout_changed signal whenever one of the parameters changes, by using layout_changed.