tests: correct the remaining fallout from recent path style changes on Windows
Per @martinvonz, `ui.slash` set by the test runner is now capable of playing a
more active role.[1] I verified that both of these work by setting `ui.slash`
to False, but these changes seem cleaner. The problem with check-perf-code.py
was that the proper imports were not being whitelisted due to '\' vs '/'.
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-February/128701.html
$ hg init repo
$ cd repo
$ echo 0 > a
$ hg ci -qAm 0
$ for i in 5 8 14 43 167; do
> hg up -q 0
> echo $i > a
> hg ci -qm $i
> done
$ cat <<EOF >> .hg/hgrc
> [alias]
> l = log -T '{rev}:{shortest(node,1)}\n'
> EOF
$ hg l
5:00f
4:7ba5d
3:7ba57
2:72
1:9
0:b
$ cat <<EOF >> .hg/hgrc
> [experimental]
> revisions.disambiguatewithin=not 4
> EOF
$ hg l
5:00
4:7ba5d
3:7b
2:72
1:9
0:b
9 was unambiguous and still is
$ hg l -r 9
1:9
7 was ambiguous and still is
$ hg l -r 7
abort: 00changelog.i@7: ambiguous identifier!
[255]
7b is no longer ambiguous
$ hg l -r 7b
3:7b
$ cd ..