A composite child is a child that’s an implementation detail of the
container it’s inside and should not be visible to people using the
container. Composite children aren’t treated differently by GTK+ (but
see gtk.container.Container.foreach_ vs. gtk.container.Container.forall), but e.g. GUI
builders might want to treat them in a different way.
Deprecated: This API never really worked well and was mostly unused, now
we have a more complete mechanism for composite children, see gtk.widget_class.WidgetClass.setTemplate.
Makes all newly-created widgets as composite children until the corresponding gtk.widget.Widget.popCompositeChild call.
A composite child is a child that’s an implementation detail of the container it’s inside and should not be visible to people using the container. Composite children aren’t treated differently by GTK+ (but see gtk.container.Container.foreach_ vs. gtk.container.Container.forall), but e.g. GUI builders might want to treat them in a different way.