annotate tests/test-dirstate-race.t @ 26011:ce77436162a5

changelog: trust C implementation of reachableroots more

There are no remaining codepaths in reachableroots where it will
return None, so just trust it completely and simplify this method.

Result by revset
================

Revision:
0) Revision 1c75249e159b: style: adjust whitespaces in webutil.py
1) Revision d1d91b8090c6: changelog: trust C implementation of reachableroots more

revset #0: 0::tip
   plain
0) 0.067684
1) 0.006622   9%

revset #1: 0::@
   plain
0) 0.068249
1) 0.009394  13%

IOW this is a 10x speedup in my repo for hg itself for 0::tip and
similar revsets now that the C code is correctly wired up.

  $ hg init
  $ echo a > a
  $ hg add a
  $ hg commit -m test

Do we ever miss a sub-second change?:

  $ for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
  >     hg co -qC 0
  >     echo b > a
  >     hg st
  > done
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a
  M a