* Use lists for available menu items.
* Remove unused template for available item types.
* Hide the type label and title from screen readers and instead include them in the add button.
props celloexpressions, afercia.
fixes#32724.
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Also includes these related changes:
* Export `oldContainer` and `newContainer` among the `customize-preview-menu-refreshed` event params for themes to be able to more easily re-initialize the DOM elements.
* Improve performance for partial refresh by only sending settings related to the menu being previewed.
* Fix previewing of menu assigned to Custom Menu by exporting a menu `term_id` as opposed to an object, as the former is more stable for comparing in in args hashes.
* Do full refresh of preview when nav menu unassigned so that the layout can be updated.
* Harden conditions for when partial refresh is eligible for a `wp_nav_menu()` instance.
Fixes#32841.
Built from https://develop.svn.wordpress.org/trunk@33138
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These args only need to be cleared out when exported to JavaScript, when they are not JSON-serializable. So the filter now clears these when gathering args for exporting to JS, but otherwise now leaves the original values to be passed through to `wp_nav_menu()`.
Fixes#32781.
Built from https://develop.svn.wordpress.org/trunk@33131
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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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* 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.
Built from https://develop.svn.wordpress.org/trunk@32891
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