Position of autocomplete results / suggestions popup breaks on node title fields

If you turn the node title field into an autocomplete field by hooking the form and adding an autocomplete path to the field, the autocomplete results are positioned incorrectly. When viewing the form in Bartik, through Firefox, the results show up in the upper left corner of the browser window.

To reproduce:
Hook into the node add form for a node type.
Define a valid autocomplete path for the title field (user/autocomplete works well for testing).
Load the form in Bartik and test the autocomplete title field.

My understanding of the problem:
The absolutely-positioned autocomplete matches list appears to make the assumption that some not-to-distant parent element is positioned relative. In the case of the title field on a node form in Bartik, that assumption is incorrect and it throws the placement off.

Proposed fix:
Update code in autocomplete.js to position the parent of the autocomplete input element relative.

Patch to follow...