[wp-trac] [WordPress Trac] #46442: Visual Editors stopped working with WordPress v5.1

[WordPress Trac]

#46442: Visual Editors stopped working with WordPress v5.1
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 Reporter:  burningthumb  |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  5.1
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by CarolKn):

 Same issue with a site on ATT hosting. A nearly exact copy of the site on
 A2 works fine, as do other WP 5.1 sites with same theme and plugins on A2,
 Siteground & Hostgator. I disabled all plugins, replaced all WordPress
 core files - to no avail. I am getting SyntaxError: "" string literal
 contains an unescaped line break in mce-view.min.js:1:5816, but replacing
 this file (or tinymce altogether) with a known good copy from 5.1 does not
 fix the problem. Text editor works fine; visual editor link doesn't work,
 and Gutenberg displays a white screen (view source has content.) Have
 installed Classic Editor plugin, but reinstalling, disabling, changing
 settings doesn't have an effect. I am reluctant to back out to 5.0.3 since
 this is a live site and the public display is not affected.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46442#comment:2>
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