[gnome-music] (6 commits) Non-fast-forward update to branch wip/jfelder/playlist-improvements

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/playlist-improvements' 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:

  f25da64... grltrackerplaylists: Rename Favorite songs to Starred Track
  a714428... playlistcontrols: Align the headers to the left edge of the
  2c886a2... playlistcontrols: Display the menu button below the headers
  e744386... playlistcontrols: Add a play button
  388bbe4... playlistcontrols: Make the menu buttons flat

Commits added to the branch:

  3b4f0cb... flatpak: Remove dconf sandbox hole (*)
  57e71f0... flatpak: Remove gvfs access (*)
  3415af5... window: Only create back button gesture once (*)
  607e8a6... playlistcontrols: Align the headers to the left edge of the
  d201f5b... playlistcontrols: Display the menu button below the headers
  e3de702... playlistcontrols: Add a play button

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