hgext/mq.py

--- a/hgext/mq.py	Fri Mar 08 16:59:36 2013 -0800
+++ b/hgext/mq.py	Wed Mar 06 20:13:09 2013 -0800
@@ -3037,7 +3037,22 @@
         wlock = repo.wlock()
         try:
             urev = repo.mq.qparents(repo, revs[0])
-            repo.dirstate.rebuild(urev, repo[urev].manifest())
+            uctx = repo[urev]
+
+            # only reset the dirstate for files that would actually change
+            # between the working context and uctx
+            descendantrevs = repo.revs("%s::." % uctx.rev())
+            changedfiles = []
+            for rev in descendantrevs:
+                # blindy reset the files, regardless of what actually changed
+                changedfiles.extend(repo[rev].files())
+
+            # reset files that only changed in the dirstate too
+            dirstate = repo.dirstate
+            dirchanges = [f for f in dirstate if dirstate[f] != 'n']
+            changedfiles.extend(dirchanges)
+
+            repo.dirstate.rebuild(urev, uctx.manifest(), changedfiles)
             repo.dirstate.write()
             update = False
         finally: