mq: properly take the wlock during the full qfold operation

Otherwise the operation could be raced… for unknown result.

hgext/mq.py

@@ -1153,7 +1153,7 b' class queue:'
                 sortedseries.append((idx, p))
 
         sortedseries.sort(reverse=True)
-        for (i, p) in sortedseries:
+        for i, p in sortedseries:
             if i != -1:
                 del self.fullseries[i]
             else:
@@ -1177,7 +1177,6 b' class queue:'
         firstrev = repo[self.applied[0].node].rev()
         patches = []
         for i, rev in enumerate(revs):
-
             if rev < firstrev:
                 raise error.Abort(_(b'revision %d is not managed') % rev)
 
@@ -3225,6 +3224,8 b' def fold(ui, repo, *files, **opts):'
         raise error.Abort(_(b'qfold requires at least one patch name'))
     if not q.checktoppatch(repo)[0]:
         raise error.Abort(_(b'no patches applied'))
+
+    with repo.wlock():
     q.checklocalchanges(repo)
 
     message = cmdutil.logmessage(ui, opts)
@@ -3263,7 +3264,6 b' def fold(ui, repo, *files, **opts):'
         message = b'\n'.join(message)
 
     diffopts = q.patchopts(q.diffopts(), *patches)
-    with repo.wlock():
         q.refresh(
             repo,
             msg=message,