[gnome-photos] (12 commits) Created branch wip/rishi/item-manager

[Debarshi Ray <debarshir src gnome org>]

The branch 'wip/rishi/item-manager' was created.

Summary of new commits:

  4af9c85... item-manager: Remove redundant NULL check
  dd5dceb... item-manager: Simplify photos_item_manager_remove_object_by
  7b177ab... item-manager: Add photos_item_manager_(un)hide_item
  a90c9b9... item-manager: Assert that new items don't have hidden URNs
  dbc2c27... item-manager: Remove hidden items that have been deleted ou
  1f5f0b0... Use photos_item_manager_(un)hide_item to handle deletes
  e105833... preview-nav-buttons: Remove redundant header
  587a71c... base-manager: Make get_object_by_id a virtual method
  7928216... base-manager: Make get_active_object a virtual method
  c0c4d52... base-manager: Add photos_base_manager_new
  b173be0... item-manager: Add an array of child BaseManagers for each W
  0f319aa... WIP