Invalid vertical scrollbar when AutoComplete + Bgiframe + fixed Height in IE6

Platform: Windows XP SP3

Browser version: IE6 in Windows XP

jQuery version: 1.8.2

jQuery UI vesrion: 1.9.2

jQuery bgiframe plugin version: 2.1.3-pre

jsfiddle example: http://jsfiddle.net/PwKfJ/10/

Reproducing the problem:

1. Use IE6 in Windows XP to browser the jsfiddle example.

2. Type 'b' in textbox to show the ui.autocomplete menu.

3. The ui-autocomplete div is showing a invalid scroll bar.

I was following the example to build a "max height scroll bar" from http://jqueryui.com/autocomplete/#maxheight.

And I wanted to deal with select element so I used bgiframe plugin.

Then use IE6 in Windows XP to browse the autocomplete widget, there will be a scroll bar even items are not filled up the "max height".

Some workaround - disable the ui-autocomplete border:

.ui-autocomplete{
    border:0 none;
}

I know it is not the best workaround, so I decided so report as a bug here. I hope there will be any fix can be deal with it.