psf / black / 1180

96%

master: 96%

Pull #826

travis-ci

collections: also apply wrap-on-trailing-comma logic to imports

I'm doing this as a separate commit just for cleanliness: I had to tweak
the behavior of maybe_remove_trailing_comma as a transitional step so
things would pass at every commit, and it's easier to reason about the
smaller change. There's no observable behavior changes other than
already-wrapped imports staying wrapped, and it's a style I haven't seen
outside Mercurial's codebase.

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