cmdserver: recreate mq object on runcommand in case queue path was changed

repo.mq needs to be recreated after queue path change.  Since there is little
benefit to keep invalidated mq object, it always delete repo.mq.

hgext/mq.py

@@ -3272,7 +3272,8 b' def reposetup(ui, repo):'
         def invalidateall(self):
             super(mqrepo, self).invalidateall()
             if localrepo.hasunfilteredcache(self, 'mq'):
-                self.mq.invalidate()
+                # recreate mq in case queue path was changed
+                delattr(self.unfiltered(), 'mq')
 
         def abortifwdirpatched(self, errmsg, force=False):
             if self.mq.applied and self.mq.checkapplied and not force:

tests/test-commandserver.py

@@ -283,6 +283,11 b' def mqoutsidechanges(server):'
     # repo.mq should be invalidated
     runcommand(server, ['qapplied'])
 
+    runcommand(server, ['qpop', '--all'])
+    os.system('hg qqueue --create foo')
+    # repo.mq should be recreated to point to new queue
+    runcommand(server, ['qqueue', '--active'])
+
 if __name__ == '__main__':
     os.system('hg init')
 

tests/test-commandserver.py.out

@@ -228,3 +228,8 b' testing mqoutsidechanges:'
  runcommand qapplied
  runcommand qapplied
 0.diff
+ runcommand qpop --all
+popping 0.diff
+patch queue now empty
+ runcommand qqueue --active
+foo