tags: avoid generating commit for an already deleted tag (
issue5752)
`$ hg tag --remove <tagname>` will keep on generating commits
regardless of checking whether the tag is deleted or not. I added a
a fix for `global` tags by aborting if `nullid` is already mapped
to the tag that is to be deleted.
Differential Revision: https://phab.mercurial-scm.org/D5780
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.