plugin XEP-0045: MUC joining refactoring:

- Join method is completely refactored so a room is now joined immediately, and MAM
  synchronisation happens in background.
- Legacy history is not used anymore to simplify code.
- Global simplification of the plugin, not more complicated states handling or message
  caching.

libervia/backend/core/xmpp.py

@@ -1645,6 +1645,9 @@ class SatMessageProtocol(xmppim.MessageProtocol):
         else:
             client.mess_id2uid[(data["from"], message_id)] = data["uid"]
 
+        if getattr(message_elt, "_is_from_archive", False):
+            extra["is_from_archive"] = True
+
         # origin
         if not from_jid_bare in (client.jid.userhostJID(), client.server_jid):
             disco_infos = await G.host.memory.disco.get_infos(client, from_jid_bare)

libervia/backend/plugins/plugin_xep_0313.py

@@ -341,6 +341,8 @@ class XEP_0313(object):
             if delay_elt is not None:
                 fwd_message_elt.addChild(delay_elt)
 
+            fwd_message_elt._is_from_archive = True
+
             return fwd_message_elt
 
     def queryFields(self, client, service=None):