1 files changed, 45 insertions, 49 deletions

diff --git a/ui/jquery.ui.core.js b/ui/jquery.ui.core.js
index d224f181a..0d263fa5f 100644
--- a/ui/jquery.ui.core.js
+++ b/ui/jquery.ui.core.js
@@ -13,13 +13,8 @@
 var uuid = 0,
 	runiqueId = /^ui-id-\d+$/;
 
-// prevent duplicate loading
-// this is only a problem because we proxy existing functions
-// and we don't want to double proxy them
+// $.ui might exist from components with no dependencies, e.g., $.ui.position
 $.ui = $.ui || {};
-if ( $.ui.version ) {
-	return;
-}
 
 $.extend( $.ui, {
 	version: "@VERSION",
@@ -52,20 +47,21 @@ $.extend( $.ui, {
 
 // plugins
 $.fn.extend({
-	_focus: $.fn.focus,
-	focus: function( delay, fn ) {
-		return typeof delay === "number" ?
-			this.each(function() {
-				var elem = this;
-				setTimeout(function() {
-					$( elem ).focus();
-					if ( fn ) {
-						fn.call( elem );
-					}
-				}, delay );
-			}) :
-			this._focus.apply( this, arguments );
-	},
+	focus: (function( orig ) {
+		return function( delay, fn ) {
+			return typeof delay === "number" ?
+				this.each(function() {
+					var elem = this;
+					setTimeout(function() {
+						$( elem ).focus();
+						if ( fn ) {
+							fn.call( elem );
+						}
+					}, delay );
+				}) :
+				orig.apply( this, arguments );
+		};
+	})( $.fn.focus ),
 
 	scrollParent: function() {
 		var scrollParent;
@@ -82,35 +78,6 @@ $.fn.extend({
 		return (/fixed/).test(this.css("position")) || !scrollParent.length ? $(document) : scrollParent;
 	},
 
-	zIndex: function( zIndex ) {
-		if ( zIndex !== undefined ) {
-			return this.css( "zIndex", zIndex );
-		}
-
-		if ( this.length ) {
-			var elem = $( this[ 0 ] ), position, value;
-			while ( elem.length && elem[ 0 ] !== document ) {
-				// Ignore z-index if position is set to a value where z-index is ignored by the browser
-				// This makes behavior of this function consistent across browsers
-				// WebKit always returns auto if the element is positioned
-				position = elem.css( "position" );
-				if ( position === "absolute" || position === "relative" || position === "fixed" ) {
-					// IE returns 0 when zIndex is not specified
-					// other browsers return a string
-					// we ignore the case of nested elements with an explicit value of 0
-					// <div style="z-index: -10;"><div style="z-index: 0;"></div></div>
-					value = parseInt( elem.css( "zIndex" ), 10 );
-					if ( !isNaN( value ) && value !== 0 ) {
-						return value;
-					}
-				}
-				elem = elem.parent();
-			}
-		}
-
-		return 0;
-	},
-
 	uniqueId: function() {
 		return this.each(function() {
 			if ( !this.id ) {
@@ -267,6 +234,35 @@ $.fn.extend({
 
 	enableSelection: function() {
 		return this.unbind( ".ui-disableSelection" );
+	},
+
+	zIndex: function( zIndex ) {
+		if ( zIndex !== undefined ) {
+			return this.css( "zIndex", zIndex );
+		}
+
+		if ( this.length ) {
+			var elem = $( this[ 0 ] ), position, value;
+			while ( elem.length && elem[ 0 ] !== document ) {
+				// Ignore z-index if position is set to a value where z-index is ignored by the browser
+				// This makes behavior of this function consistent across browsers
+				// WebKit always returns auto if the element is positioned
+				position = elem.css( "position" );
+				if ( position === "absolute" || position === "relative" || position === "fixed" ) {
+					// IE returns 0 when zIndex is not specified
+					// other browsers return a string
+					// we ignore the case of nested elements with an explicit value of 0
+					// <div style="z-index: -10;"><div style="z-index: 0;"></div></div>
+					value = parseInt( elem.css( "zIndex" ), 10 );
+					if ( !isNaN( value ) && value !== 0 ) {
+						return value;
+					}
+				}
+				elem = elem.parent();
+			}
+		}
+
+		return 0;
 	}
 });