[wp-trac] [WordPress Trac] #57995: Popup flickering in Firefox

[WordPress Trac]

#57995: Popup flickering in Firefox
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 Reporter:  robehr79                 |       Owner:  (none)
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  Future Release
Component:  TinyMCE                  |     Version:  6.0
 Severity:  major                    |  Resolution:
 Keywords:  has-screenshots has-     |     Focuses:  javascript,
  testing-info needs-patch           |  administration
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Comment (by sabernhardt):

 The flickering should be rarer now; I do not experience it with the new
 Classic block modal. Firefox can still have the problem when the block
 editor is not in an iframe (showing the Custom Fields panel or activating
 a plugin such as Yoast SEO would keep the non-framed editor).

 The toolbar element (I found `#mceu_18` near the end of the `body`)
 repeatedly adds and removes `display: none` to the `style` attribute. The
 script comment from #44911 mentions flickering (or "flicketing") in
 Chromium. I was able to change the flashing rate with a different timeout
 value, which indicates that the
 [https://core.trac.wordpress.org/browser/trunk/src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js?rev=53047#L1127
 resize section] runs in Firefox, too.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57995#comment:25>
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