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'.
$ rm -rf a
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am0
adding a
$ hg tag t1 # 1
$ hg tag --remove t1 # 2
$ hg co 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg tag -f -r0 t1
$ hg tags
tip 3:a49829c4fc11
t1 0:f7b1eb17ad24