PageScene object has no attribute 'stampTickQMark'

Some kind of button mashing on the zigzag branch got me to this:

Traceback (most recent call last):
  File "/home/cbm/src/plom/plom.git/plom/client/pagescene.py", line 1035, in mouseReleaseEvent
    return getattr(self, functionName, None)(event)
  File "/home/cbm/src/plom/plom.git/plom/client/pagescene.py", line 1283, in mouseReleaseTick
    self.stampTickQMark(event)
AttributeError: 'PageScene' object has no attribute 'stampTickQMark'

Will try to reproduce later