What matches the text being typed (after the last comma) is offered right
under the box instead of in the Suggestions block further down: Down / Up
move through the offers, Return or a click gives the highlighted one (with
the keywords typed before it) and leaves the cursor in the box. With none
highlighted, Return gives what was typed, as before.
A name the library doesn't have is announced as a new keyword, with the
keyword it would go inside, before Return creates it.
The offers have a cache of their own: they and the suggestions are both
asked for on every frame of typing, and each looks through the library's
keywords.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
