[wp-trac] [WordPress Trac] #45235: REST API: Setting _locale can cause fatal errors

[WordPress Trac]

#45235: REST API: Setting _locale can cause fatal errors
--------------------------+-------------------------
 Reporter:  pento         |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  high          |  Milestone:  5.0
Component:  I18N          |    Version:  5.0
 Severity:  major         |   Keywords:  needs-patch
  Focuses:  rest-api      |
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 `determine_locale()` calls `is_user_logged_in()` when the `_locale`
 parameter is set in a REST API request.

 However, `is_user_logged_in()` is a pluggable function, which loads after
 plugins do, so if any plugins call `__()` as soon as they're loaded, it
 will cause a fatal error.

 Related: #44758, [43776].

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Ticket URL: <https://core.trac.wordpress.org/ticket/45235>
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