Hitting enter doesn't work in Issue Navigator search box when autocomplete is visible

We seem to have broken keyboard search entry on the issue navigator on JAC (currently 6.2-m07). This seems quite important to me - it blocks me using the issue nav with the keyboard effectively.

Steps to reproduce:

• create a new search in the issue navigator (say, on JAC)
• type "project = CONF"
• wait for the autocomplete to appear, if it hasn't already
• hit enter

Expected results:

• the search executes and you get some results

Actual results:

• hitting enter does nothing.

Workaround:

• you can click the search button, hit <tab>, <enter> or select something from the autocomplete and hit enter.