Update line drawing on small window when redoing.
Update line drawing on small window when redoing.


Former-commit-id: 60e1e0d649af19a899390fe91a8789e87eaeca2e
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox