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dotCooCoo
10909656d9
`unite_all` and `try_unite_all` swept each input under its own fill rule and then swept all the resulting contours again under NonZero. With one input whose sweep split and dropped none of its segments, the second sweep ran over the same simple contours and doubled the time. Such an input is now refit from the first sweep's contours. Inputs that cross themselves and unions of several inputs are still swept again, and the input paths are converted once instead of twice.