[wp-trac] [WordPress Trac] #53332: Transforming a Legacy Widget to a Block Widget is not possible in WP 5.8

[WordPress Trac]

#53332: Transforming a Legacy Widget to a Block Widget is not possible in WP 5.8
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 Reporter:  imath         |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.8
Component:  Widgets       |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Changes (by imath):

 * keywords:   => has-patch


Comment:

 I've found the reason why. While the documentation page and the Gutenberg
 plugin are using the Widget's class `$show_instance_in_rest` property.
 WordPress decided to stop checking this property into the Widgets REST
 endpoints in favor of looking into the
 `$widget_options['show_instance_in_rest']` property.

 [https://core.trac.wordpress.org/attachment/ticket/53332/53332.patch
 53332.patch] is fixing my issue. The patch is a kind of back compatibility
 mechanism for early testers who got used to the `$show_instance_in_rest`
 property.

 If you think it's not needed, I'd advise to at least update this
 [https://developer.wordpress.org/block-editor/how-to-guides/widgets
 /legacy-widget-block/ documentation page] (to avoid misleading developers)
 to explain people now need to include a
 `$widget_options['show_instance_in_rest'] = true` when registering their
 widget.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/53332#comment:3>
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