[gnome-music] (18 commits) Non-fast-forward update to branch wip/mschraal/gapless-v3

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/gapless-v3' 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:

  7651eda... Introduce gapless playback
  f131b41... grilo: Add idle_add to writeback
  4fc6dca... gstplayer: Reset tick on stream start
  5bb3464... player: Small optimization

Commits added to the branch:

  9f002ea... player: Remove empty line (*)
  6956756... player: Remove unused url property (*)
  a3d9dad... smoothScale: Do not start the player after a seek operation (*)
  ab64880... gstplayer: Filter duplicate state changes (*)
  9e910e9... player: Define state GObject property (*)
  450cbbb... player: Define duration GObject property (*)
  15e921f... player: Use second unit to set position (*)
  5d46407... smoothscale: Do not interact with GstPlayer (*)
  9f049df... smoothscale: Use GObject property syntax (*)
  13aef83... gstplayer: Use GObject property syntax (*)
  4d0709e... grilo: Add idle_add to writeback
  6d809ce... Introduce gapless playback
  9e6f531... gstplayer: Reset tick on stream start
  6b9c6fd... player: Small optimization
  700943e... more optimization
  7fa7afe... more fixess
  ddc635f... trigger state change
  1a14fa7... fix duration

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