1.4.3 RC1 breaks jQuery UI dialog

[jagid]

I know that there is a jQuery UI element to this issue but as the below code works with 1.4.2 a change in 1.4.3 is causing the issue. With the below code the dialog does not display unless the buttons line is removed.

<div id="testdiv">Test content<div>

<link href="​http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/smoothness/jquery-ui.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="​http://code.jquery.com/jquery-1.4.3rc1.js"></script> <script type="text/javascript" src="​http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/jquery-ui.min.js"></script> <script type="text/javascript">

$(document).ready(function () {

$("#testdiv").dialog({

buttons: { "OK": function () { alert($(this).html()); }}

});

});

</script>

[snover]

Issue only occurs with buttons property active. Looks like jQuery 1.4.3 checks for properties on cur in .closest but cur is not always defined, so it generates an error. Line 4193 needs a !cur in the conditional. ​Live test case

[snover]

​pull req

[john]

Duplicate of #7142.