app-window: Add 'current-item' prop
Prepares its move from App to AppWindow because each window may have a different current item. Also makes App's current_item attribute a property to bind them during the move. This is needed to drop the use of AppWindow singleton and therefore to make multiple windows possible. https://bugzilla.gnome.org/show_bug.cgi?id=732098
parent
c1c4b830
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