[wp-trac] [WordPress Trac] #55438: Flaky result when saving widgets in the Widgets Editor

[WordPress Trac]

#55438: Flaky result when saving widgets in the Widgets Editor
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 Reporter:  kevin940726   |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Widgets       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:  rest-api      |
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 I discovered this while trying to migrate the
 [https://github.com/WordPress/gutenberg/blob/3b1674a147c8e943b0d3727e0f4cbe379c2d9922/packages
 /e2e-tests/specs/widgets/editing-widgets.test.js#L123-L233 editing-
 widgets] e2e tests in Gutenberg. I think the test is currently skipped for
 the same reason.

 By un-skipping the test and running it several times, it sometimes fails
 at the last step where the snapshot doesn't match. It mysteriously
 contains a `wp_inactive_widgets: ''` field in the serialized result. I
 think the bug is from a race condition in the REST API. I managed to
 record a HAR file so that you can plug it in Chrome's devtools and inspect
 it.

 I'm not familiar with the PHP side of the code, but it seems like
 sometimes a widget block won't be saved to the specified sidebar, and
 instead be put inside `wp_inactive_widgets`.

 Maybe someone with more knowledge around this can help debugging it? Sorry
 that there's isn't a reliable reproduction steps though.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55438>
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