mq: turn changeset draft on qfinish (except if qparent is secret)

As mq automatically sets changesets as secret, it should make them draft when he
is done with it. We do not move them automatically to draft when we detect that
something else have also set them as secret through their parents.

hgext/mq.py

@@ -46,7 +46,7 b' from mercurial.i18n import _'
 from mercurial.node import bin, hex, short, nullid, nullrev
 from mercurial.lock import release
 from mercurial import commands, cmdutil, hg, scmutil, util, revset
-from mercurial import repair, extensions, url, error
+from mercurial import repair, extensions, url, error, phases
 from mercurial import patch as patchmod
 import os, re, errno, shutil
 
@@ -750,6 +750,7 b' class queue(object):'
             for p in patches:
                 os.unlink(self.join(p))
 
+        qfinished = []
         if numrevs:
             qfinished = self.applied[:numrevs]
             del self.applied[:numrevs]
@@ -776,6 +777,7 b' class queue(object):'
 
         self.parseseries()
         self.seriesdirty = True
+        return [entry.node for entry in qfinished]
 
     def _revpatches(self, repo, revs):
         firstrev = repo[self.applied[0].node].rev()
@@ -803,7 +805,11 b' class queue(object):'
 
     def finish(self, repo, revs):
         patches = self._revpatches(repo, sorted(revs))
-        self._cleanup(patches, len(patches))
+        qfinished = self._cleanup(patches, len(patches))
+        if qfinished:
+            oldqbase = repo[qfinished[0]]
+            if oldqbase.p1().phase() < phases.secret:
+                phases.advanceboundary(repo, phases.draft, [oldqbase.node()])
 
     def delete(self, repo, patches, opts):
         if not patches and not opts.get('rev'):
@@ -2918,9 +2924,15 b' def finish(ui, repo, *revrange, **opts):'
     revs = scmutil.revrange(repo, revrange)
     if repo['.'].rev() in revs and repo[None].files():
         ui.warn(_('warning: uncommitted changes in the working directory\n'))
-
+    # queue.finish may changes phases but leave the responsability to lock the
+    # repo to the caller to avoid deadlock with wlock. This command code is
+    # responsability for this locking.
+    lock = repo.lock()
+    try:
     q.finish(repo, revs)
     q.savedirty()
+    finally:
+        lock.release()
     return 0
 
 @command("qqueue",