The first view added to the stack is the EmptyView which is not
visible on launch. Then, AlbumsView is added and becomes the
visible_child by default because it is visible. However, it is not
selected by the the stack switcher because the
"notify::visible-changed" signal is received before the child is added
to the stack switcher.

This issue is fixed by adding a "visible-child" notification. This
way, the stack switcher selected the AlbumView on launch.