[wp-trac] [WordPress Trac] #59480: Harden/modernize JS in WP_Customize_Manager::remove_frameless_preview_messenger_channel()

[WordPress Trac]

#59480: Harden/modernize JS in
WP_Customize_Manager::remove_frameless_preview_messenger_channel()
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 Reporter:  westonruter               |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  low                       |   Milestone:  6.4
Component:  Customize                 |     Version:  4.7
 Severity:  normal                    |  Resolution:
 Keywords:  good-first-bug has-patch  |     Focuses:  javascript
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Changes (by nicolefurlan):

 * Attachment "59480.diff" added.

 Patch for #59480

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Ticket URL: <https://core.trac.wordpress.org/ticket/59480>
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