[wp-trac] [WordPress Trac] #44402: Flickering Tinymce Link toolbox on mouseover. (Only on Windows) - introduced in 4.9.6

[WordPress Trac]

#44402: Flickering Tinymce Link toolbox on mouseover. (Only on Windows) -
introduced in 4.9.6
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 Reporter:  jesperher     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  4.9.6
 Severity:  normal        |   Keywords:
  Focuses:                |
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 When hovering over links toolbox, in TinyMCE (Main-content field) and
 their edit button the box start to flickering.

 I tried to record it, but on the video, it just seems to be hidden. But it
 is actual flickering
 http://recordit.co/VLxdbM5dGc

 Steps to reproduce the error.
 * Use Windows machine. (doesn't happens on mac)
 * WordPress 4.9.6 (4.9.5 doesn't have the issue)
 * Create Custom post type,
 * With: Supports: title, editor.¨

 Installed:
 * WordPress 4.9.6
 * Theme: twenty-seventeen
 * Plugins: Only the plugin to register the custom post type


 Possible "Hackish soulutions":
 * adding "custom-fields" to supports.
 * downgrading to 4.9.5

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Ticket URL: <https://core.trac.wordpress.org/ticket/44402>
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