[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:
                                                 |  nicolefurlan
     Type:  defect (bug)                         |      Status:  assigned
 Priority:  low                                  |   Milestone:  6.4
Component:  Customize                            |     Version:  4.7
 Severity:  normal                               |  Resolution:
 Keywords:  good-first-bug has-patch has-        |     Focuses:  javascript
  testing-info needs-testing                     |
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Comment (by westonruter):

 @nicolefurlan Thank you for the patch! FYI: No need to attach a patch as
 you can see the GitHub PR is automatically linked above. I'll review your
 PR.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59480#comment:5>
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