REST API: Can't delete multiple widgets in a single batch request

[noisysocks]

If you attempt to delete (with force=1) multiple widgets in a single batch request, only one widget is deleted.

Example request using ​https://httpie.io:

http -a admin:password POST http://wp-git-build.test/wp-json/batch/v1 requests:='[{"method":"DELETE","path":"/wp/v2/widgets/block-2?force=1"},{"method":"DELETE","path":"/wp/v2/widgets/block-3?force=1"},{"method":"DELETE","path":"/wp/v2/widgets/block-4?force=1"}]'

Trac ticket: https://core.trac.wordpress.org/ticket/53557

If you try to delete multiple widgets in a single batch request, only one widget is deleted. This is because deleting a widget sets the WP_Widget::$updated flag which blocks all future updates in a request. The fix is to reset the flag.

@noisysocks this looks very good and fixes ​https://github.com/WordPress/gutenberg/issues/33069 Let's merge it!

@noisysocks this looks very good and fixes ​https://github.com/WordPress/gutenberg/issues/33069 Let's merge it!

[andraganescu]

This was causing issues when deleting widgets. Orphaned widgets would randomly pop up in widget areas or in the inactive widgets area. Usually classic widgets remained. Applying the linked PR made the problem ​here impossible to repro. Let's add this patch.

[SergeyBiryukov]

In 51277:

REST API: Allow multiple widgets to be deleted in a single batch request.

This resets the WP_Widget::$updated flag when deleting a widget, to avoid blocking all future updates in a request.

Props noisysocks, andraganescu.
Fixes #53557.

[SergeyBiryukov]

Reopening for backporting to the 5.8 branch.

[desrosj]

In 51290:

REST API: Allow multiple widgets to be deleted in a single batch request.

This resets the WP_Widget::$updated flag when deleting a widget, to avoid blocking all future updates in a request.

Props noisysocks, andraganescu.
Merges [51277] to the 5.8 branch.
Fixes #53557.