transplant: set a blockedtag when invoking external filter

hgext/transplant.py

@@ -260,7 +260,8 b' class transplanter(object):'
                            environ={'HGUSER': changelog[1],
                                     'HGREVISION': nodemod.hex(node),
                                     },
-                           onerr=error.Abort, errprefix=_('filter failed'))
+                           onerr=error.Abort, errprefix=_('filter failed'),
+                           blockedtag='transplant_filter')
             user, date, msg = self.parselog(file(headerfile))[1:4]
         finally:
             os.unlink(headerfile)