From 89af4c292eaa5fc1c83437ca71085264dcbef34a Mon Sep 17 00:00:00 2001
From: Alexander Schmitz <arschmitz@gmail.com>
Date: Mon, 12 Sep 2016 10:26:24 -0400
Subject: Widget: Untrack classes elements when they are removed from the DOM

Fixes #15043
Closes gh-1744
---
 ui/widget.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'ui')

diff --git a/ui/widget.js b/ui/widget.js
index 06a3ce88e..a3922675f 100644
--- a/ui/widget.js
+++ b/ui/widget.js
@@ -514,6 +514,10 @@ $.Widget.prototype = {
 			}
 		}
 
+		this._on( options.element, {
+			"remove": "_untrackClassesElement"
+		} );
+
 		if ( options.keys ) {
 			processClassString( options.keys.match( /\S+/g ) || [], true );
 		}
@@ -524,6 +528,15 @@ $.Widget.prototype = {
 		return full.join( " " );
 	},
 
+	_untrackClassesElement: function( event ) {
+		var that = this;
+		$.each( that.classesElementLookup, function( key, value ) {
+			if ( $.inArray( event.target, value ) !== -1 ) {
+				that.classesElementLookup[ key ] = $( value.not( event.target ).get() );
+			}
+		} );
+	},
+
 	_removeClass: function( element, keys, extra ) {
 		return this._toggleClass( element, keys, extra, false );
 	},
-- 
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