[gnome-music] (8 commits) Non-fast-forward update to branch wip/jfelder/open-audio-files

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/open-audio-files' 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:

  14c236d... coresong: Add is_filesystem property
  e983879... coremodel: Add a model to store opened files
  e3c124c... grilowrappers: Add support for filesystem source
  89a7ffb... views: Add a view to handle opened audio files
  630dc3c... window: Set the stack transition once it is populated
  386e6a0... application: Handle files opening

Commits added to the branch:

  91cac18... playertoolbar: Remove margin property usage (*)
  3901350... coresong: Add missing gtype_name (*)
  d415983... coresong: Add is_filesystem property
  d2337c7... coremodel: Add a model to store opened files
  8fb5f21... grilowrappers: Add support for filesystem source
  e3f4173... views: Add a view to handle opened audio files
  3221d9e... window: Set the stack transition once it is populated
  0664702... application: Handle files opening

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