Fixes #2179

src/core.py

@@ -923,7 +923,7 @@ class Core(object):
             self.add_message_to_text_buffer(room, _("%(nick)s set the subject to: %(subject)s") % {'nick':nick_from, 'subject':subject}, time=None)
         else:
             self.add_message_to_text_buffer(room, _("The subject is: %(subject)s") % {'subject':subject}, time=None)
-        room.topic = subject.replace('\n', '|')
+        room.topic = subject
         if self.get_tab_by_name(room_from, tabs.MucTab) is self.current_tab():
             self.refresh_window()
 

src/room.py

@@ -45,6 +45,9 @@ class Room(TextBuffer):
         self.users = []
         self.joined = False
 
+    def get_single_line_topic(self):
+        return self.topic.replace('\n', '|')
+
     def log_message(self, txt, time, nickname):
         """
         Log the messages in the archives, if it needs

src/tabs.py

@@ -709,7 +709,7 @@ class MucTab(ChatTab):
         if self.need_resize:
             self.resize()
         log.debug('  TAB   Refresh: %s'%self.__class__.__name__)
-        self.topic_win.refresh(self._room.topic)
+        self.topic_win.refresh(self._room.get_single_line_topic())
         self.text_win.refresh(self._room)
         self.v_separator.refresh()
         self.user_win.refresh(self._room.users)