feat(model): show desktop notifications for enabled streams

* Linked to #666 (probably only a partial fix so far)

Author: myii

zulipterminal/model.py

@@ -671,8 +671,10 @@ def notify_user(self, message: Message) -> str:
                 ]
                 target = ', '.join(extra_targets)
             recipient = ' (to {})'.format(target)
-        elif {'mentioned', 'wildcard_mentioned'}.intersection(
-                set(message['flags'])) and message['type'] == 'stream':
+        elif message['type'] == 'stream' and (
+            {'mentioned', 'wildcard_mentioned'}.intersection(set(message['flags']))
+            or self.stream_dict[message['stream_id']]['desktop_notifications']
+        ):
             recipient = ' (to {} -> {})'.format(message['display_recipient'],
                                                 message['subject'])