test-split: split now ignores diff.* settings
From 66399f2e92aa: "It is assumed by the author that the `[diff]` section is
primarily for *viewing* diffs, and that it is unlikely what people intend when
attempting to commit or revert."
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate -I 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null