Makes @visible_child visible using a transition determined by
HdyLeaflet:transition-type and HdyLeaflet:child-transition-duration. The
transition can be cancelled by the user, in which case visible child will
change back to the previously visible child.
Makes @visible_child visible using a transition determined by HdyLeaflet:transition-type and HdyLeaflet:child-transition-duration. The transition can be cancelled by the user, in which case visible child will change back to the previously visible child.