[gnome-music] (12 commits) Non-fast-forward update to branch wip/mschraal/albumartists-cleanup

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/albumartists-cleanup' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  800b506... artistalbumwidget: Mark create_disc_box private
  6faafa0... selectiontoolbar: Add items-selected property
  6100eaf... selectiontoolbar: Add add-to-playlist signal
  3a52e7b... artistalbumswidget: Remove unused argument
  3b6a70a... disclistboxwidget: DiscBox minor cleanups
  1f39fbc... baseview: Set selection-mode prop on state request
  bce55bd... headerbar: Bind selection-mode prop directly to button
  218cd71... baseview: Connect to class selection-mode property
  3ecb70b... headerbar: Handle cancel button in class
  4cff12a... albumwidget: Add selection-mode property
  6116662... disclistboxwidget: Remove selection-toggle signal
  592aede... headerbar: Add selection-mode-allowed prop

Commits added to the branch:

  6af5634... artistalbumwidget: Mark create_disc_box private
  f913a0a... selectiontoolbar: Add items-selected property
  07d0b66... selectiontoolbar: Add add-to-playlist signal
  9930972... artistalbumswidget: Remove unused argument
  acf54f1... disclistboxwidget: DiscBox minor cleanups
  4525d5e... baseview: Set selection-mode prop on state request
  b3337ef... headerbar: Bind selection-mode prop directly to button
  9fd9d1a... baseview: Connect to class selection-mode property
  c234e8d... headerbar: Handle cancel button in class
  abf2382... albumwidget: Add selection-mode property
  9c03827... disclistboxwidget: Remove selection-toggle signal
  971876f... headerbar: Add selection-mode-allowed prop