[wp-trac] [WordPress Trac] #53452: [WP 5.8 beta 2] $_POST['sidebar'] is missing when saving a widget

[WordPress Trac]

#53452: [WP 5.8 beta 2] $_POST['sidebar'] is missing when saving a widget
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 Reporter:  strategio     |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.8
Component:  Widgets       |     Version:  trunk
 Severity:  critical      |  Resolution:
 Keywords:  has-patch     |     Focuses:  administration, rest-api
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Comment (by strategio):

 Replying to [comment:3 spacedmonkey]:
 > Why is this data needed? If it needed, then there is other data is
 missing. See this example.

 In our case, we have widgets that needs to know the assigned sidebar in
 order to set the initial settings. But there's no form element for our
 widget, the settings UI is shown in another place.

 So to be honest, I didn't pay attention to the other form data, but I
 believe it should be passed to the superglobal to keep WP 5.8 backward
 compatible with legacy widget.

 For the 'sidebar', I believe it's legit to expose this information
 somewhere because `\WP_Widget::update` is called from
 `\WP_REST_Widgets_Controller::save_widget` which has this information as
 the second argument.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53452#comment:4>
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