fix a deadlock in "hg unhide"

Summary:
The `hg unhide` command acquired the repo lock without acquiring the wlock.
This causes locking order problems, as it calls other parts of the code that
will acquire the `wlock` (such as autopull during revset resolution) while it
is already holding the `lock`.

This can cause `hg unhide` to deadlock with other `hg` commands that acquire
`wlock` before `lock`.

Reviewed By: kulshrax

Differential Revision: D24129559

fbshipit-source-id: cf31ec661123df329f1773d2b67deb474d6476f8

eden/scm/edenscm/hgext/amend/hide.py

@@ -187,7 +187,7 @@ def unhide(ui, repo, *revs, **opts):
     commits will also become visible.
     """
     revs = list(revs) + opts.pop("rev", [])
-    with repo.lock():
+    with repo.wlock(), repo.lock():
         revs = set(scmutil.revrange(repo, revs))
         _dounhide(repo, revs)