def on_editing_started(self, cellrenderer, editable, path):
# Retrieve comment in original form
model = self.get_tree_view().get_model()
iter = model.get_iter(path)
track = model.get_value(iter, 0)
comment = TrackFormatter('$comment').format(track)
# Escape newlines
comment = comment.encode('unicode-escape')
# Set text
editable.set_text(comment)
