Dialog: Tabbing out of a modal dialog was possible because keypress doesn't fire for tabs everywhere, switched to keyup. Added Unit Test - Caught by @DomenicDenicola - Fixes #3123 - Tabbing stops in modal dialog

tests/unit/dialog/dialog_tickets.js

@@ -3,7 +3,36 @@
  */
 (function($) {
 
-module("dialog: tickets");
+module( "dialog: tickets" );
+
+asyncTest( "#3123: Prevent tabbing out of modal dialogs", function() {
+	expect( 3 );
+
+	var el = $( "<div><input id='t3123-first'><input id='t3123-last'></div>" ).dialog({ modal: true }),
+		inputs = el.find( "input" ),
+		widget = el.dialog( "widget" );
+
+	inputs.eq( 1 ).focus();
+	equal( document.activeElement, inputs[1], "Focus set on second input" );
+	inputs.eq( 1 ).simulate( "keyup", { keyCode: $.ui.keyCode.TAB });
+
+	setTimeout( checkTab, 2 );
+
+	function checkTab() {
+		ok( $.contains( widget, document.activeElement ), "Tab key event moved focus within the modal" );
+
+		// check shift tab
+		$( document.activeElement ).simulate( "keydown", { keyCode: $.ui.keyCode.TAB, shiftKey: true });
+		setTimeout( checkShiftTab, 2 );
+	}
+
+	function checkShiftTab() {
+		ok( $.contains( widget, document.activeElement ), "Shift-Tab key event moved focus within the modal" );
+
+		el.remove();
+		start();
+	}
+});
 
 test("#4826: setting resizable false toggles resizable on dialog", function() {
 	expect(6);

ui/jquery.ui.dialog.js

@@ -293,7 +293,7 @@ $.widget("ui.dialog", {
 
 		// prevent tabbing out of modal dialogs
 		if ( options.modal ) {
-			uiDialog.bind( "keypress.ui-dialog", function( event ) {
+			uiDialog.bind( "keyup.ui-dialog", function( event ) {
 				if ( event.keyCode !== $.ui.keyCode.TAB ) {
 					return;
 				}