From bbd9c776ea22296a6807d5b760bd4e82ee5f4414 Mon Sep 17 00:00:00 2001
From: Dave Methvin <dave.methvin@gmail.com>
Date: Mon, 4 Apr 2011 10:27:31 -0400
Subject: [PATCH] Fix #8732. Change feature detect for focusin event support,
 so IE9 won't have duplicate events.

---
 src/event.js   | 2 +-
 src/support.js | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/event.js b/src/event.js
index 0323ffb75..9a63b5f93 100644
--- a/src/event.js
+++ b/src/event.js
@@ -850,7 +850,7 @@ function trigger( type, elem, args ) {
 }
 
 // Create "bubbling" focus and blur events
-if ( document.addEventListener ) {
+if ( !jQuery.support.focusinBubbles ) {
 	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {
 	
 		// Attach a single capturing handler while someone wants focusin/focusout
diff --git a/src/support.js b/src/support.js
index 4c309562f..8b950e25f 100644
--- a/src/support.js
+++ b/src/support.js
@@ -226,6 +226,7 @@
 
 	jQuery.support.submitBubbles = eventSupported("submit");
 	jQuery.support.changeBubbles = eventSupported("change");
+	jQuery.support.focusinBubbles = document.attachEvent && eventSupported("focusin");
 
 	// release memory in IE
 	div = all = a = null;