Comment 12 for bug 487052

Issue as originally reported:
> If I try to save my work as a hpgl-file for a vinyl cutter,
> the output plugin doesn't work:
> (…)
> File "/usr/local/share/inkscape/extensions/ffgeom.py", line 66, in delta_x
> return self[1]['x'] - self[0]['x']
> RuntimeError: maximum recursion depth exceeded

seems the same issue as reported in
Bug #340123 “Effects - Modify Path - Flatten Beziers fails on complicated paths with small flatness parameter”
<https://bugs.launchpad.net/inkscape/+bug/340123>