Remove template api override

engine/api.py

@@ -133,15 +133,6 @@ class ClientCallbacks(Callbacks): #inherits from the templates api callbacks
         for func in self.trackStructureChanged:
             func(export)
 
-    def _numberOfTracksChanged(self):
-        """sent the current track order as list of ids, combined with their structure.
-        This is also used when tracks get created or deleted, also on initial load.
-        This also includes the pattern.
-        """
-        lst = [track.export() for track in session.data.tracks]
-        for func in self.numberOfTracksChanged:
-            func(lst)
-
     def _trackMetaDataChanged(self, track):
         """a low cost function that should not trigger anything costly to redraw
         but some text and simple widgets."""