Please, look this code, may be it's bug?
https://github.com/blackwarthog/synfig/commit/6e7d2dff6f2ef90647916de3180b3f3e6becafba
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Possibly it is a trace of the development of the Advanced Outline
implementation. It can be safely removed I think.
Notice that 'iter' becomes 'next' during the iterations so maybe trailing
the iter is not needed.
If later we find a render artifact we can try to fix it but as far as I
know, it
