ref(compactSelect): Auto-select single option on Enter when searching

[JonasBa]

When a user types in the search box and narrows the list down to exactly one visible option, pressing Enter now automatically selects that option. Previously Enter was a no-op in the search input (it only prevented form submission).

The implementation queries enabled (non-hidden, non-disabled) list items in the overlay on Enter. Hidden options are already marked aria-disabled by the list state, so filtering on that attribute cleanly identifies what's actually selectable. If exactly one item is left, it receives a programmatic click, going through the normal React Aria selection path including onChange and the menu closing logic.

When multiple options are still visible, Enter continues to do nothing, avoiding accidental selections.

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[TkDodo]

I don’t think going via the dom is what we should be doing here. Control has access to all items, so it should know if there’s only one item. It doesn’t have access to onChange, but what we probably should do is something similar that onClear is doing, because in the parent, we can easily invoke onChange:

sentry/static/app/components/core/compactSelect/compactSelect.tsx

Lines 219 to 230 in 7508699

	onClear={({overlayState}) => {
	if (clearable) {
	if (multiple) {
	onChange([]);
	} else {
	onChange(undefined);
	}
	if (shouldCloseOnSelect?.({...listProps, selectedOptions: []})) {
	overlayState?.close();
	}
	}
	}}

Concretely, I’d suggest:

• add on onEnter callback
• have the parent decide:
  • if there is only one element in items, invoke onChange. close select if necessary (shouldCloseOnSelect, see onClear. This could be extracted to its own function triggerOnChange.
  • if there are more items, maybe we could have Enter focus the list instead like tab does?