[gnome-music/wip/jfelder/mpris-fix-playlist-changes: 1/2] mpris: Listen to the player model changes once a song is playing

[Jean Felder <jfelder src gnome org>]

commit 5c35fe25ae7e6e5948e578c48c0f91810334f5da
Author: Jean Felder <jfelder src gnome org>
Date:   Wed Nov 20 23:23:50 2019 +0100

    mpris: Listen to the player model changes once a song is playing
    
    If the "items-changed" signal from the player model is connected
    before the model is populated, the MPRIS tracklist will be populated
    with a list of empty track the first time it is filled.
    
    Fix the issue by connecting this signal once the first song starts
    playing.

 gnomemusic/mpris.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gnomemusic/mpris.py b/gnomemusic/mpris.py
index 9792e1ea..edfb310f 100644
--- a/gnomemusic/mpris.py
+++ b/gnomemusic/mpris.py
@@ -293,8 +293,7 @@ class MPRIS(DBusInterface):
 
         self._coremodel = app.props.coremodel
         self._player_model = self._coremodel.props.playlist_sort
-        self._player_model.connect(
-            "items-changed", self._on_player_model_changed)
+        self._player_model_changed_id = None
 
         self._coremodel.connect(
             "playlist-loaded", self._on_player_playlist_changed)
@@ -518,6 +517,10 @@ class MPRIS(DBusInterface):
             if self._previous_can_play is True:
                 return
 
+        if self._player_model_changed_id is None:
+            self._player_model_changed_id = self._player_model.connect_after(
+                "items-changed", self._on_player_model_changed)
+
         self._on_player_model_changed(None, 0, 0, 0)
 
     def _on_player_model_changed(self, model, pos, removed, added):