[gnome-music] (6 commits) Non-fast-forward update to branch wip/mschraal/tracker-change-tracking-fix

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/tracker-change-tracking-fix' 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:

  236c7df... grltrackerwrapper: Reuse Core{Album,Artist} on change
  4a71faf... coredisc: Remove changed items tracking in CoreDisc

Commits added to the branch:

  8d3fe8d... Revert "coreartist: Load the model only if the artist is se (*)
  fa1d1e7... Revert "coremodel: Load the model only if the album is sele (*)
  acd8673... corealbum: Do not update the model if the selection has not (*)
  1b974ff... coreartist: Do not update the model if the selection has no (*)
  ed6b934... grltrackerwrapper: Reuse Core{Album,Artist} on change
  7ff523d... coredisc: Remove changed items tracking in CoreDisc

(*) This commit already existed in another branch; no separate mail sent