[GRASS-dev] proper v.parallel behavior on strange input

[Росен Матев]

Hello,
I'm currently reimplementing v.parallel/v.buffer. There are some
strange inputs with no apparent behavior. Please suggest what should
v.parallel do on such inputs.
I've attached a simple input. Try to make a parallel line on right
side of the given line; distance is greater than 5m (let's say 7m).
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