Autocomplete listbox on resize of browser window

The autocomplete listbox does not re-position itself on re-size of the browser window. This can be reproduced even on the jQueryUI autoComplete demo page:

http://jqueryui.com/demos/autocomplete/

Browsers: Can be reproduced on IE(8, did not test on 7) and FireFox-3.6.13

OS: Windows XP

jQuery UI autocomplete version: 1.8.1

Steps to reproduce:

1. Launch: http://jqueryui.com/demos/autocomplete/ page in either IE 8 or FireFox. Note that the browser window has to maximized or should be at the maximum size at this step.

2. Once, the page is loaded, in the tag field, enter 'j' and wait for autocomplete to display some options.

3. Once the options are displayed, DO NOT select any options and click on the 'restore down' button of the browser (the one on the top right corner of the browser beside the close button)

4. The window gets resized, but the autocomplete listbox still remains at its old position. It DOES NOT re-position itself to be displayed below the combobox.

NOTE: This happens only when the 'restore down' button is clicked. When we try to re-size the window manually by dragging and shrinking it with mouse, the listbox positions itself correctly beneath the combo-box.