[Maxim Koltsov] Set different WM_WINDOW_ROLE to different windows types (gc, chat). Fixes #6746

src/message_window.py

@@ -75,6 +75,8 @@ class MessageWindow(object):
         self.widget_name = 'message_window'
         self.xml = gtkgui_helpers.get_gtk_builder('%s.ui' % self.widget_name)
         self.window = self.xml.get_object(self.widget_name)
+        # Set window role to differ chats from MUCs
+        self.window.set_role(self.type_)
         self.notebook = self.xml.get_object('notebook')
         self.parent_paned = None