Keep the autocomplete results on screen for the quick search.

The autocomplete results list was aligned to the left of the input
field, causing it to often appear off-screen. The autocomplete code has
been fixed to detect when this may happen, and instead will align the
window with the right of the input.

Tested at various widths to be sure that the results looked correct.

Verified that the existing autocomplete cases still align as they used to.