[wp-trac] [WordPress Trac] #43984: Customize: JavaScript error when opening Text widget

[WordPress Trac]

#43984: Customize: JavaScript error when opening Text widget
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 Reporter:  dlh           |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  trunk
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 All that should be needed to replicate is to try to expand a Text widget
 in the Customizer.

 The error is `Uncaught TypeError: Cannot read property 'zIndex' of
 undefined`, and it occurs here: https://github.com/WordPress/wordpress-
 develop/blob/6d2bcaa9b39264e5bc8145cf8895f303cabf3fcd/src/wp-admin/js
 /customize-controls.js#L9256. The error prevents the visual editor from
 loading.

 I think the error began with the TinyMCE update in #43862. Unfortunately,
 I'm not sure where to begin looking within those changes for what the
 cause might be.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43984>
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