Changing receipt not received warning timeout from 2 to 4 seconds, not everybody has a

good connection.

src/conversation_textview.py

@@ -439,7 +439,7 @@ class ConversationTextview:
 
 			self.xep0184_shown[id_] = SHOWN
 			return False
-		gobject.timeout_add_seconds(2, show_it)
+		gobject.timeout_add_seconds(4, show_it)
 
 		buffer.end_user_action()