Hdy.Deck: A method to get the previous child
Oftentimes I have a deck where I'm navigating using a back button that should have the name of the previous page. For example, I'm in System Settings on the "Mouse & Touchpad" page and there is a back button that should say "Bluetooth" since that's where I just came from.
It would be convenient to be able to easily get the "previous" child in the deck so that I could use its properties for my navigation button. Something like:
Gtk.Widget Hdy.Deck.get_previous_child ()