Tabs: Work around bad Safari/VoiceOver heuristics

Move disabled tab click handlers from the container to the tablist to
prevent panel contents from being announced as clickable.

Fixes #10098
Closes jquerygh-1261

Author: mpiotrowicz

ui/tabs.js

@@ -75,24 +75,7 @@ return $.widget( "ui.tabs", {
 
 		this.element
 			.addClass( "ui-tabs ui-widget ui-widget-content ui-corner-all" )
-			.toggleClass( "ui-tabs-collapsible", options.collapsible )
-			// Prevent users from focusing disabled tabs via click
-			.delegate( ".ui-tabs-nav > li", "mousedown" + this.eventNamespace, function( event ) {
-				if ( $( this ).is( ".ui-state-disabled" ) ) {
-					event.preventDefault();
-				}
-			})
-			// support: IE <9
-			// Preventing the default action in mousedown doesn't prevent IE
-			// from focusing the element, so if the anchor gets focused, blur.
-			// We don't have to worry about focusing the previously focused
-			// element since clicking on a non-focusable element should focus
-			// the body anyway.
-			.delegate( ".ui-tabs-anchor", "focus" + this.eventNamespace, function() {
-				if ( $( this ).closest( "li" ).is( ".ui-state-disabled" ) ) {
-					this.blur();
-				}
-			});
+			.toggleClass( "ui-tabs-collapsible", options.collapsible );
 
 		this._processTabs();
 		options.active = this._initialActive();
@@ -393,7 +376,26 @@ return $.widget( "ui.tabs", {
 
 		this.tablist = this._getList()
 			.addClass( "ui-tabs-nav ui-helper-reset ui-helper-clearfix ui-widget-header ui-corner-all" )
-			.attr( "role", "tablist" );
+			.attr( "role", "tablist" )
+
+			// Prevent users from focusing disabled tabs via click
+			.delegate( "> li", "mousedown" + this.eventNamespace, function( event ) {
+				if ( $( this ).is( ".ui-state-disabled" ) ) {
+					event.preventDefault();
+				}
+			})
+
+			// support: IE <9
+			// Preventing the default action in mousedown doesn't prevent IE
+			// from focusing the element, so if the anchor gets focused, blur.
+			// We don't have to worry about focusing the previously focused
+			// element since clicking on a non-focusable element should focus
+			// the body anyway.
+			.delegate( ".ui-tabs-anchor", "focus" + this.eventNamespace, function() {
+				if ( $( this ).closest( "li" ).is( ".ui-state-disabled" ) ) {
+					this.blur();
+				}
+			});
 
 		this.tabs = this.tablist.find( "> li:has(a[href])" )
 			.addClass( "ui-state-default ui-corner-top" )
@@ -711,6 +713,8 @@ return $.widget( "ui.tabs", {
 			.removeAttr( "tabIndex" )
 			.removeUniqueId();
 
+		this.tablist.unbind( this.eventNamespace );
+
 		this.tabs.add( this.panels ).each(function() {
 			if ( $.data( this, "ui-tabs-destroy" ) ) {
 				$( this ).remove();