Dominik Schilling 2ce8d2eea2 Customizer: Accessibility enhancements.
* Move tabindex/focus code into `onChangeExpanded` so that it works for cases where `expand()` is called directly.
* Use `visibility: hidden` to hide hidden elements from keyboard focus and screen readers.

props celloexpressions.
fixes #31336.
Built from https://develop.svn.wordpress.org/trunk@33069


git-svn-id: http://core.svn.wordpress.org/trunk@33040 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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