[Combobox]: Acess isOpen/isExpanded

[CodingDive]

🚀 Feature request

I'd love to be able to access the isExpanded state of the Combobox.

Current Behavior

There is no way to access it other than reading data-attributes[data-reach-combobox-popover] in the DOM. (WRONG)

Suggested Solution

Expose the read-only prop by hook or render prop.

Who does this impact? Who is this for?

Everyone who wants to use the state.

In my example, I would sometimes want to resort or change the list data after a Combobox item was selected. I only want to update the list when it's closed otherwise it'd lead to some twitter-like UX 😁

It would also allow me to work around #395 by only changing state in the onDismiss prop of the Dialog when the Combobox is expanded. This would probably still mess up the focusing because of the unmount/remount but it'd be something.

Describe alternatives you've considered

Checking data-attributes.

Actual solution

While writing this issue, I found the useComboboxContext hook in the docs that already exposes isExpanded 🤦‍♂️

I decided to post it anyhow to cross-reference and in the hope, it may be useful to someone.