alias: shortcut command matching show shadowing works properly (issue3104)
An alias for 'log' was stored in the same command table as
'^log|history'. If the hash function happens to give the latter first,
the alias is effectively ignored when matching 'log'.
$ "$TESTDIR/hghave" execbit || exit 80
$ hg init repo
$ cd repo
$ echo foo > foo
$ chmod 644 foo
$ hg ci -qAm '644'
$ chmod 755 foo
$ hg ci -qAm '755'
reverting to rev 0
$ hg revert -a -r 0
reverting foo
$ hg st
M foo
$ hg diff --git
diff --git a/foo b/foo
old mode 100755
new mode 100644