view .clang-format @ 36346:f62369667a7c

py3: use list comprehensions instead of filter where we need to eagerly filter

These two uses of filter() are then checked for truthiness, but on Python 3:

>>> bool(filter(None, []))
True

So we need to stop depending on that. Fortunately it's easy to replace
the filter with an equivalent list comprehension.

Differential Revision: https://phab.mercurial-scm.org/D2364

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