escape text before sending it to notification daemin. Fixes #4517

src/notify.py

@@ -320,6 +320,9 @@ def popup(event_type, jid, account, msg_type='', path_to_image=None,
 	'''Notifies a user of an event. It first tries to a valid implementation of
 	the Desktop Notification Specification. If that fails, then we fall back to
 	the older style PopupNotificationWindow method.'''
+	# escape text like <3
+	text = gobject.markup_escape_text(text)
+	title = gobject.markup_escape_text(title)
 	if gajim.config.get('use_notif_daemon') and dbus_support.supported:
 		try:
 			DesktopNotification(event_type, jid, account, msg_type,