grep: add config knob to enable/disable the default wdir search
This allows us to conditionally enable the new behavior to unbreak
python-hglib. See the next patch.
The config option is undocumented since the --all-files is still experimental
and isn't fully implemented. It can be moved to [experimental] if that's
preferred.
Differential Revision: https://phab.mercurial-scm.org/D3918
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg update 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo This is file c1 > c
$ hg add c
$ hg commit -m "commit #2"
created new head
$ hg merge 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ rm b
$ echo This is file c22 > c
Test hg behaves when committing with a missing file added by a merge
$ hg commit -m "commit #3"
abort: cannot commit merge with missing files
[255]