[issue17005] Add a topological sort algorithm

[gaborbernat]

gaborbernat <gaborjbernat at gmail.com> added the comment:

I think the new interface feeds better for usage in both sequential or parallel workflows, which means we can use a single UI for both, so 👍 from myself

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nosy: +gaborbernat

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<https://bugs.python.org/issue17005>
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