topic-revset: changectx creation in the revset
The current mutability filter is very expensive, we use a more direct and
efficent way to do so:
Before:
! wall 0.213261 comb 0.210000 user 0.210000 sys 0.000000 (best of 45)
After:
! wall 0.012195 comb 0.020000 user 0.020000 sys 0.000000 (best of 217)
#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 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null