[wp-trac] [WordPress Trac] #31294: Customizer no longer gracefully handles session expiration

[WordPress Trac]

#31294: Customizer no longer gracefully handles session expiration
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 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.2
Component:  Customize     |    Version:  trunk
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 Reported by ocean90:

 > In r31370 you've changed doing_ajax() to return only true for `defined(
 'DOING_AJAX' ) && DOING_AJAX`, and not `isset( $_POST['customized'] )`
 anymore. This breaks the preview if you're logged out because you get a
 regular `wp_die()` with HTML instead of the `0`.

 https://wordpress.slack.com/archives/core-customize/p1423601418000599

 Issue introduced (at least partially) by changes introduced in #30936.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31294>
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