MAM: Always reset state on reconnect

It was not reset if the previous MAM query was interrupted because of a disconnect

gajim/common/connection.py

@@ -1346,6 +1346,7 @@ class Connection(CommonConnection, ConnectionHandlers):
         self._discover_server()
         self._set_send_timeouts()
         self.get_module('Chatstate').enabled = True
+        self.get_module('MAM').reset_state()
 
     def _set_send_timeouts(self):
         if app.config.get_per('accounts', self.name, 'keep_alives_enabled'):

gajim/common/modules/mam.py

@@ -68,6 +68,10 @@ class MAM(BaseModule):
                          account=self._account,
                          feature=self.archiving_namespace))
 
+    def reset_state(self):
+        self._mam_query_ids.clear()
+        self._catch_up_finished.clear()
+
     def _from_valid_archive(self, _stanza, properties):
         if properties.type.is_groupchat:
             expected_archive = properties.jid