WP_Theme_JSON: sync indirect properties changes from core

[oandregal]

What?

This PR syncs the Gutenberg class with the corresponding WordPress core changes.

Why?

By being in sync, future backport processes will be much easier.

Context:

• Original PR in Gutenberg Global styles: Allow indirect properties when unfiltered_html is not allowed #46388
• PR as backported to core Global Styles: Fix block spacing values being stripped for users without unfiltered_html capability wordpress-develop#3742

How?

Copy the code from core to Gutenberg.

[github-actions]

Flaky tests detected in 23d8bce.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4305527875
📝 Reported issues:

• [Flaky Test] dims the background image down by 50% when transformed from the Image block #47052 in specs/editor/blocks/cover.test.js

[andrewserong]

Thanks for backporting the backport @oandregal! 😄

This is still testing well for me (added define( 'DISALLOW_UNFILTERED_HTML', true ); locally, then tested that content and wide size, and block spacing values save in global styles) 👍

In case anyone's comparing this PR against the diff in WordPress/wordpress-develop#3742, this PR correctly uses the * @since 6.2.0 line in core, rather than the * @since 6.1.2 line from that PR's diff.

LGTM! ✨

[peterwilsoncc]

this PR correctly uses the * @since 6.2.0 line in core, rather than the * @since 6.1.2 line from that PR's diff.

I think that was altered in a follow up commit so that core used the correct version. It seems 6.2 will be released first.

[andrewserong]

I think that was altered in a follow up commit so that core used the correct version. It seems 6.2 will be released first.

Thanks for confirming!