[wp-trac] [WordPress Trac] #30781: broken "Header" screen in new update 4.1

[WordPress Trac]

#30781: broken "Header" screen in new update 4.1
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 Reporter:  lennybratcher  |       Owner:
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  Future Release
Component:  Customize      |     Version:  4.1
 Severity:  normal         |  Resolution:
 Keywords:  needs-patch    |     Focuses:  javascript
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Comment (by westonruter):

 @lennybratcher: Please try installing [attachment:array-prototype-indexof-
 polyfill.php] as a plugin and see if that fixes the issue for you. If so,
 then we can proceed with adding such a polyfill to Core; specifically, we
 should use Underscore's `indexOf` implementation.

 This plugin would provide a workaround for the problem in the mean time.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30781#comment:13>
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