observe_guides

Returns a `GListModel` to track the guides that are part of the layout.

Calling this function will enable extra internal bookkeeping to track guides and emit signals on the returned listmodel. It may slow down operations a lot.

Applications should try hard to avoid calling this function because of the slowdowns.

Parameters:

this	a `GtkConstraintLayout`

Returns:

a `GListModel` tracking the layout's guides