Support old and deprecated XEP 0091 because it's still used on buggy servers...

Support old and deprecated XEP 0091 because it's still used on buggy servers like @conference.codingteam.net. Fixed #1677

src/common.py

@@ -264,7 +264,10 @@ def datetime_tuple(timestamp):
     """
     timestamp = timestamp.split('.')[0]
     timestamp = timestamp.replace('-', '')
-    ret = datetime.strptime(timestamp, '%Y%m%dT%H:%M:%SZ')
+    try:
+        ret = datetime.strptime(timestamp, '%Y%m%dT%H:%M:%SZ')
+    except ValueError:      # Support the deprecated format, XEP 0091 :(
+        ret = datetime.strptime(timestamp, '%Y%m%dT%H:%M:%S')
     # convert UTC to local time, with DST etc.
     dst = timedelta(seconds=time.altzone)
     ret -= dst

src/gui.py

@@ -387,7 +387,14 @@ class Gui(object):
             delayed = True
             date = common.datetime_tuple(delay_tag.getAttr('stamp'))
         else:
-            delayed = False
+            # We support the OLD and deprecated XEP: http://xmpp.org/extensions/xep-0091.html
+            # But it sucks, please, Jabber servers, don't do this :(
+            delay_tag = stanza.getTag('x', namespace='jabber:x:delay')
+            if delay_tag:
+                delayed = True
+                date = common.datetime_tuple(delay_tag.getAttr('stamp'))
+            else:
+                delayed = False
         if stanza.getType() != 'groupchat':
             return  # ignore all messages not comming from a MUC
         nick_from = stanza.getFrom().getResource()