Fix for GH-22

playback.on_current_playlist_change() was not called for all changes to
the current playlist. Thus, the playback controllers internal shuffled
version of the current playlist (used for random mode), was not always
updated when the current playlist was updated.

mopidy/backends/base/current_playlist.py

@@ -12,13 +12,10 @@ class BaseCurrentPlaylistController(object):
     :type backend: :class:`BaseBackend`
     """
 
-    #: The current playlist version. Integer which is increased every time the
-    #: current playlist is changed. Is not reset before Mopidy is restarted.
-    version = 0
-
     def __init__(self, backend):
         self.backend = backend
         self._cp_tracks = []
+        self._version = 0
 
     def destroy(self):
         """Cleanup after component."""
@@ -42,6 +39,19 @@ class BaseCurrentPlaylistController(object):
         """
         return [ct[1] for ct in self._cp_tracks]
 
+    @property
+    def version(self):
+        """
+        The current playlist version. Integer which is increased every time the
+        current playlist is changed. Is not reset before Mopidy is restarted.
+        """
+        return self._version
+
+    @version.setter
+    def version(self, version):
+        self._version = version
+        self.backend.playback.on_current_playlist_change()
+
     def add(self, track, at_position=None):
         """
         Add the track to the end of, or at the given position in the current