OptionalautoOptionalclassClass(es) for the panel root.
OptionalcontextThe catalog: category list, per-category listing and ranked text search.
Optionalon"That one" — a double-click on a row. The host takes its default action.
The selection changed: a click, an arrow key, or a new query landing on its own top row.
The chosen function. CONTROLLED — the host needs it (to insert it, or to fill its arguments).
Take focus (the search box) on mount.