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
$ cat >> $HGRCPATH << EOF
> [extensions]
> absorb=
> EOF
Abort absorb if there is an unfinished operation.
$ hg init abortunresolved
$ cd abortunresolved
$ echo "foo1" > foo.whole
$ hg commit -Aqm "foo 1"
$ hg update null
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo "foo2" > foo.whole
$ hg commit -Aqm "foo 2"
$ hg --config extensions.rebase= rebase -r 1 -d 0
rebasing 1:c3b6dc0e177a tip "foo 2"
merging foo.whole
warning: conflicts while merging foo.whole! (edit, then use 'hg resolve --mark')
unresolved conflicts (see 'hg resolve', then 'hg rebase --continue')
[240]
$ hg --config extensions.rebase= absorb
abort: rebase in progress
(use 'hg rebase --continue', 'hg rebase --abort', or 'hg rebase --stop')
[20]