From 416fa04d3b97e05bf1b698bc361e18d3b4687219 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 29 Nov 2021 22:46:29 +0530
Subject: [PATCH] Make doubly sure the ready message is sent only once

---
 src/pyj/iframe_comm.pyj | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/pyj/iframe_comm.pyj b/src/pyj/iframe_comm.pyj
index 6f29279b0c..492b91be52 100644
--- a/src/pyj/iframe_comm.pyj
+++ b/src/pyj/iframe_comm.pyj
@@ -186,11 +186,12 @@ class IframeClient:
         self.handlers.initialize = self.initialize
         self.ready_sent = False
         window.addEventListener('message', self.handle_message, False)
-        window.addEventListener('load', def():
-            if not self.ready_sent:
-                self.send_message('ready', {})
-                self.ready_sent = True
-        )
+        window.addEventListener('load', self.send_ready, {'once': True})
+
+    def send_ready(self):
+        if not self.ready_sent:
+            self.send_message('ready', {})
+            self.ready_sent = True
 
     def initialize(self, data):
         nonlocal print