Show preview of "Jump to" result

Also let the user cancel (esc) the "jump to" to restore the selected
index to wherever it was before.

A neat thing you can do with this: Your cursor will automatically move
to whatever the matched result of your query is while typing. If nothing
is found, your cursor will stay where it was the last time it found
something: so, if you press enter to confirm, AFTER you've queried
something but WHILE your query doesn't currently mathc anything, it'll
keep the cursor at whatever was most recently matched. So basically,
Ctrl-F'ing "excir" will match "Excursions", since "exc" will have
matched it already.

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