Refresh file size after partial qrefresh.

This makes a subsequent hg revert; hg status work.

hgext/mq.py

@@ -1070,7 +1070,7 b' class queue:'
                     mm.append(m[i])
                     del m[i]
             repo.dirstate.update(m, 'n')
-            repo.dirstate.update(mm, 'n', st_mtime=0)
+            repo.dirstate.update(mm, 'n', st_mtime=-1, st_size=-1)
             repo.dirstate.forget(forget)
 
             if not msg: