Weird outline overlap behaviour

[caryoscelus]

Synfig version: both 1.0.2 and 1.3.1/master

Issue description:

When excessive width is applied to outline/adv.outline layers, holes start to appear in the overlapping regions instead of outline filling the whole area.

I'm not sure whether this can be a problem in any real usecases or whether it can instead be exploited to create random effects, but in any case it seems to be unobvious undocumented behaviour.

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