Adds validation for initially-supplied nav menu name, blocking empty names from being supplied. If later an empty name is supplied and the nav menu is saved, the name "(unnamed)" will be supplied instead and supplied back to the client. If a name is supplied for the menu which is currently used by another menu, then the name conflict is resolved by adding a numerical counter similar to how `post_name` conflicts are resolved. Includes unit tests.
Fixes#32760.
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Improve targeting for the `sortableItems`, resolving an issue where the first `<li>` in the control became a sortable target, allowing the user to drag a single top level menu outside the intended sortable area.
props adamsilverstein.
fixes#32738.
#wceu
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* Add a description and an `aria-describedby` attribute to inform users this is a "live" search.
* Announce the number of search results via `wp.a11y.speak`.
* Use `aria-busy` attribute to stop screen readers announcing content while the "loading more results" is running.
* Increase the search debounce wait interval to 500ms to be consistent with other live searches.
* If a search fails don't call `wp.a11y.speak` with an undefined variable.
props afercia.
see #32720.
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