Sets subpage as the window's subpage and opens it.
The transition can be cancelled by the user, in which case visible child will change back to the previously visible child.
the subpage
Deprecated: Use adw.preferences_window.PreferencesWindow.pushSubpage instead.
Sets subpage as the window's subpage and opens it.
The transition can be cancelled by the user, in which case visible child will change back to the previously visible child.