correctly decide whether to autonegotiate after a session was replaced

src/chat_control.py

@@ -1153,7 +1153,6 @@ class ChatControl(ChatControlBase):
 				self.print_esession_details()
 
 		# Enable encryption if needed
-		self.no_autonegotiation = False
 		e2e_is_active = self.session and self.session.enable_encryption
 		self.gpg_is_active = False
 		gpg_pref = gajim.config.get_per('contacts', contact.jid,
@@ -2325,18 +2324,22 @@ class ChatControl(ChatControlBase):
 				self.account, 'autonegotiate_esessions') and \
 				gajim.config.get_per('contacts',
 				self.contact.jid, 'autonegotiate_esessions')
+
 			want_e2e = not e2e_is_active and not self.gpg_is_active \
 				and e2e_pref
 
+			already_negotiating = bool(self.session and \
+				self.session.status)
+
 			# XXX: Once we have fallback to disco, remove
 			#      notexistant check
-			if want_e2e and not self.no_autonegotiation \
-			and gajim.HAVE_PYCRYPTO \
-			and gajim.capscache.is_supported(self.contact,
-			NS_ESESSION) and not gajim.capscache.is_supported(
-			self.contact, 'notexistant'):
+			can_e2e = gajim.HAVE_PYCRYPTO and gajim.capscache. \
+				is_supported(self.contact, NS_ESESSION) and \
+				not gajim.capscache.is_supported(self.contact,
+				'notexistant')
+
+			if want_e2e and not already_negotiating and can_e2e:
 				self.begin_e2e_negotiation()
-				self.no_autonegotiation = True
 		else:
 			self.send_chatstate('active', self.contact)
 

src/gajim.py

@@ -816,9 +816,6 @@ class Interface:
 				for sess in  conn.get_sessions(ji):
 					if (ji+'/'+resource) != str(sess.jid):
 						continue
-					ctrl = sess.control
-					if ctrl:
-						ctrl.no_autonegotiation = False
 					if sess.enable_encryption:
 						sess.terminate_e2e()
 						conn.delete_session(jid,