mergestate: make in-memory mergestate not clear on-disk mergestate on reset()...
mergestate: make in-memory mergestate not clear on-disk mergestate on reset()
Oops, I thought I had remove the `rmtree()` call earlier. Maybe I
accidentally got it back in a histedit or something.
Differential Revision:
https://phab.mercurial-scm.org/D9042