Overview of changes in 3.23.3
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* Bugs fixed:
 763712 Use G_DECLARE_FINAL_TYPE
 774191 item-manager: Emit GListModel::items-changed
 775153 Forget the last non-range selection when leaving selection mode
 775562 Don't use PhotosViewModel in PhotosMainToolbar
 775754 Find an alternative to PhotosPreviewModel
 763908 tracker-controller: Don't use g_cancellable_reset