[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:  Awaiting Review
Component:  TinyMCE       |    Version:  6.1.1
 Severity:  major         |   Keywords:
  Focuses:                |
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 This bug is somehow related to #44911, however, 5 years after that, the
 bug appears in Firefox. I copy-paste here what I wrote in the forum
 (https://wordpress.org/support/topic/toolbar-of-tinymce-flickering-in-
 firefox/):

 I found the releavant code in the file `wp-
 include/js/tinymce/plugins/wordpress/plugin.js` in line 1127 and
 following, stating:

 {{{



                                         /*
                                          * Showing a tooltip may trigger a
 resize event in Chromium browsers.
                                          * That results in a flicketing
 inline menu; tooltips are shown on hovering over a button,
                                          * which then hides the toolbar on
 resize, then it repeats as soon as the toolbar is shown again.
                                          */
                                         if ( event.type === 'resize' ||
 event.type === 'resizewindow' ) {
 }}}

 Funnily enough, there is a remark about this behaviour, but it concerns
 only Chromium. Firefox uses the event `scroll`. I tried appending it to
 the condition, and it really fixed the problem. However, I do not know if
 just appending `|| event.type === 'scroll'` does not break other things.
 Actually, I think that the correct solution would be like this: The
 current condition is about resizing. There should be another condition
 which caches the previous scrolling position and bails out early if the
 scroll position did not change altough the event is fired.

 This code is present at least since WordPress 6.0 and also in 6.1.1.

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