Improves the `containFocus()` function to always get the correct first and last focusable elements, even when the theme browser shows the active theme details. Also, when on the first and last theme, adds a `disabled` attribute on the previous and next navigation buttons to make them not focusable. Fixes #37383. git-svn-id: https://develop.svn.wordpress.org/trunk@38084 602fd350-edb4-49c9-b593-d223f7449a82
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