Search keyboard up/down should bring selected item into focus

[shawnbot]

If you use the keyboard to scroll through a long list of search results, the cursor will just scroll right past the visible area. It should scroll down to always show the selected item.

Note: this bug is caused by my kinda hacky solution to get the little arrow nubbin on top of the search results listing. I could probably find another way to do this instead of trying to emulate what the browser does naturally.