Autocomplete: Autocomplete kills undo (ctrl+z) in IE 8

This appears to be a bigger issue than IE8. See http://jsfiddle.net/aSs7s/2/. On my Windows Vista box, undo stops working as soon as you type something that causes the autocomplete options to display. This happens in IE9 as well as IE9 simulating IE8 and IE7.

While not quite the same, undo also doesn't work in Safari 5.1.2 after selecting an option from the autocomplete menu. I confirmed this on both Windows Vista as well as Mac OS X 10.7.2.

This does not appear to be an issue in Chrome 16, Firefox 9, and Opera 11.60.

IE won't allow to perform ctrl+z(Undo) immediately after a DOM append or InnerHTML operation.

I guess this is the reason.

For example simply type any text that is not related to any items in the menu,Now do any operations like deleting the text using delete or back space key. CTRL+Z will work. But If you type any text that will show the menu, Now try deleting the text using delete or backspace key , Now try ctrl+z it will not work.

It's because when the text in the textarea or input matches with the list, We are appending the matched items to the menu and finally to the DOM . In this case IE breaks the CTRL+Z ie. undo

Confirmed that IE is killing undo after any DOM mutation. There's nothing we can do about this.