core (xmpp): added "extra" argument to client.feedback

sat/core/xmpp.py

@@ -700,14 +700,18 @@ class SatXMPPClient(SatXMPPEntity, wokkel_client.XMPPClient):
         self.send(mess_data[u"xml"])
         defer.returnValue(mess_data)
 
-    def feedback(self, to_jid, message):
+    def feedback(self, to_jid, message, extra=None):
         """Send message to frontends
 
         This message will be an info message, not recorded in history.
         It can be used to give feedback of a command
         @param to_jid(jid.JID): destinee jid
         @param message(unicode): message to send to frontends
+        @param extra(None, dict): extra data to use
+            in particular, info subtype can be specified with MESS_EXTRA_INFO
         """
+        if extra is None:
+            extra = {}
         self.host_app.bridge.messageNew(
             uid=unicode(uuid.uuid4()),
             timestamp=time.time(),
@@ -716,7 +720,7 @@ class SatXMPPClient(SatXMPPEntity, wokkel_client.XMPPClient):
             message={u"": message},
             subject={},
             mess_type=C.MESS_TYPE_INFO,
-            extra={},
+            extra=extra,
             profile=self.profile,
         )