[gnome-music/wip/mschraal/playlists-player-sync] coremodel: Listen to changed on playlists

[Marinus Schraal <mschraal src gnome org>]

commit 291dff95fabb75e52fc8841048a3b73c8fe5708a
Author: Marinus Schraal <mschraal gnome org>
Date:   Tue Sep 3 01:36:17 2019 +0200

    coremodel: Listen to changed on playlists
    
    Playlists were mistakenly not handling live actions to the playlist and
    passing them on to the PlayerPlaylist.
    
    Have the player model react to playlist model changes as well.

 gnomemusic/coremodel.py | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/gnomemusic/coremodel.py b/gnomemusic/coremodel.py
index 80d8f25d..0df16163 100644
--- a/gnomemusic/coremodel.py
+++ b/gnomemusic/coremodel.py
@@ -79,6 +79,7 @@ class CoreModel(GObject.GObject):
         super().__init__()
 
         self._flatten_model = None
+        self._playlist_signal_id = None
         self._previous_playlist_model = None
         self._search_signal_id = None
         self._song_signal_id = None
@@ -326,6 +327,10 @@ class CoreModel(GObject.GObject):
 
                 self.emit("playlist-loaded")
             elif playlist_type == PlayerPlaylist.Type.PLAYLIST:
+                if self._playlist_signal_id:
+                    self._previous_playlist_model.disconnect(
+                        self._playlist_signal_id)
+
                 for model_song in model:
                     song = CoreSong(
                         model_song.props.media, self._coreselection,
@@ -341,6 +346,9 @@ class CoreModel(GObject.GObject):
                         GObject.BindingFlags.BIDIRECTIONAL
                         | GObject.BindingFlags.SYNC_CREATE)
 
+                self._playlist_signal_id = model.connect(
+                    "items-changed", _on_items_changed)
+
                 self.emit("playlist-loaded")
 
         self._previous_playlist_model = model