This function can be used to automatically position new pages, and to select
the correct page when this page is closed while being selected (see
[method@TabView.close_page]).
If @parent is NULL, this function is equivalent to [method@TabView.append].
Adds @child to @self with @parent as the parent.
This function can be used to automatically position new pages, and to select the correct page when this page is closed while being selected (see [method@TabView.close_page]).
If @parent is NULL, this function is equivalent to [method@TabView.append].