[wp-trac] [WordPress Trac] #41489: Customize Preview: do not show `cursor: not-allowed` on audio/video track titles within playlists

[WordPress Trac]

#41489: Customize Preview: do not show `cursor: not-allowed` on audio/video track
titles within playlists
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 Reporter:  celloexpressions         |       Owner:
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  4.9
Component:  Customize                |     Version:  4.7
 Severity:  normal                   |  Resolution:
 Keywords:  needs-testing has-patch  |     Focuses:  ui
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Comment (by westonruter):

 One former reason to use jQuery's `hasClass()` instead of HTML5's
 `classList.contains()` is that the latter is only supported as of IE11.
 It's true that WordPress no longer supports versions older than that, but
 there's no reason why we have to intentionally break it here since jQuery
 `addClass()` is already being used in this same function.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41489#comment:6>
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