[wp-trac] [WordPress Trac] #57601: Custom browser user agent breaks visual editor

[WordPress Trac]

#57601: Custom browser user agent breaks visual editor
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 Reporter:  Ov3rfly       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  6.1.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 If browser user agent is not in a certain parseable(?) format, editor is
 broken and allows only simple text editing.

 Set browser user agent e.g. to this text: `Some custom user agent`

 See also attached screenshots.

 Reproducible with Firefox and Chrome latest release.

 Won't register at GitHub due to reasons, so this bug report is here.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57601>
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