extensions: ignore "sub-options" when looking for extensions
config suboptions are separated by ":" (see the path one for example). So we
dont want to confuse these config with actual extensions.
We don't have extensions sub option yet, but I am about to introduce one for
making sure an extensions can load. So lets level the floor first.
Differential Revision: https://phab.mercurial-scm.org/D11819
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.
Notes for packagers
===================
Mercurial ships a copy of the python-zstandard sources. This is used to
provide support for zstd compression and decompression functionality. The
module is not intended to be replaced by the plain python-zstandard nor
is it intended to use a system zstd library. Patches can result in hard
to diagnose errors and are explicitly discouraged as unsupported
configuration.