Hotfix: Fix Query Loop with excerpt outputting invalid HTML

[fushar]

Fixes Automattic/wp-calypso#98922

Proposed changes:

This PR "reverts" the logic added in WordPress/gutenberg#67272, purely from Dotcom side.

The above PR broke Query Loop block which contains excerpts. This is more visible when the posts have nontrivial blocks at the beginning, e.g. blockquote:

Before (with the bug)	After (with this hotfix)

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

1. Create a post.
2. Add some non-trivial blocks in the post such as blockquote.
3. Publish the post.
4. Create a page.
5. Insert a Query Loop block, which includes post excerpt in the setting.
6. Publish the page.
7. View the page.
8. Verify it contains broken HTML (see screenshot above).
9. Patch this PR.
10. Verify the page does not contain broken HTML anymore.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the hotfix-query-loop-bug branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin hotfix-query-loop-bug
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

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[merkushin]

Works well 👍