From 8b57d179a1655dbce081b321445f34a4aad696f4 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Tue, 26 May 2015 06:03:07 +0100
Subject: Add comment noting why we need AsyncDataFetcher.

---
 content_scripts/ui_component.coffee | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'content_scripts')

diff --git a/content_scripts/ui_component.coffee b/content_scripts/ui_component.coffee
index 31274c3e..24982fa7 100644
--- a/content_scripts/ui_component.coffee
+++ b/content_scripts/ui_component.coffee
@@ -27,7 +27,9 @@ class UIComponent
     # Hide the iframe, but don't interfere with the focus.
     @hide false
 
-    # Open a port and pass it to the iframe via window.postMessage.
+    # Open a port and pass it to the iframe via window.postMessage.  We use an AsyncDataFetcher to handle
+    # requests which arrive before the frame (and its message handlers) have completed initialization.  See
+    # #1679.
     @iframePort = new AsyncDataFetcher (setIframePort) =>
       @iframeElement.addEventListener "load", =>
         # Get vimiumSecret so the iframe can determine that our message isn't the page impersonating us.
-- 
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