* ensure that the portal root is always in the DOM

When using NextJS, it happens that between page transitions the portal
root gets removed form the DOM. We will check the DOM when the `target`
updates, and if it doesn't exist anymore, then we will re-insert it in
the DOM.

* update changelog

* feat(react): Allow Tab Component to be controlled

* fix falsy bug

`selectedIndex || defaultIndex` would result in the `defaultIndex` if
`selectedIndex` is set to 0. This means that if you have this code:

```js
<Tab.Group selectedIndex={0} defaultIndex={2} />
```

That you will never be able to see the very first tab, unless you
provided a negative value like `-1`.

`selectedIndex ?? defaultIndex` fixes this, since it purely checkes for
`undefined` and `null`.

* implemented controllable Tabs for Vue

* add dedicated test to ensure changing the defaultIndex has no effect

* update changelog

Co-authored-by: ChiefORZ <[email protected]>

Co-authored-by: superDragon <[email protected]>

Co-authored-by: Ryan Gossiaux <[email protected]>

* ensure that the order of DOM nodes is correct

When we are performing actions like `focusIn(list, Focus.First)` then we
have to ensrue that we are working with the correct list that is
properly sorted.

It can happen that the list of DOM nodes is out of sync. This can happen
if you have 3 Tabs, hide the second (which triggers an unmount and an
`unregister` of the Tab), then re-add the second item in the middle.
This will re-add the item to the end of the list instead of in the middle.

We can solve this by always sorting items when we are adding / removing
items, but this is a bit more error prone because it is easy to forget.
Instead we will sort it when performing the actual keyboard action.

If we didn't provide a list but an element, then we use a
getFocusableElements(element) function, but this already gives you a
correctly sorted list so we don't need to do that for this list.

* add tests to prove the correct order when performing actions

* cleanup code just for tests

It could still happen that this internal list is not ordered correctly
but that's not really a problem we just have the list to keep track of
things.

For our tests we now use the position from the DOM directly.

* update changelog