Merge the Gutenberg Updates into WordPress Trunk for the 5.8 release

[youknowriad]

This is an overview issue to track the progress of the integration of the Gutenberg Projects that area meant to land in Core for the 5.8 release before feature freeze (May 25). (See this post for the details about the included projects)

Related WordPress Trac ticket: https://core.trac.wordpress.org/ticket/52991

• Theme.json infrastructure https://core.trac.wordpress.org/ticket/53175

  • Theme.json Global Styles infrastructure. Add global styles wordpress-develop#1287
  • Theme.json Global Settings infrastructure. Add __experimentalFeatures data for the block editor wordpress-develop#1262
  • Theme.json: update merging algorithm. Update color merging algorithm wordpress-develop#1289
  • Fully backport the layout block support. Add layout block supports wordpress-develop#1295
  • Add a conditional check about the "classic.css" dependency in the style loader (only load it for non theme.json themes). Only load wp-editor-classic-layout-styles styles for themes without theme.json support wordpress-develop#1290
  • Add the supportsLayout editor setting.

• Theme blocks (This happens automatically with package updates but we need to mark these blocks as stable in the Gutenberg repository first)

  • Check PHP logic required for some of these blocks like default block context required by the Query block. https://core.trac.wordpress.org/ticket/53250
  • Check the extra block patterns than need to be include to Core (Social Links, Query): https://core.trac.wordpress.org/ticket/53248
  • Enable Site Logo and related REST API changes. https://core.trac.wordpress.org/ticket/53247
  • Remove Post Author.
  • Figure out the frontend.js script loading for the File block.

• Template editing in the post editor https://core.trac.wordpress.org/ticket/53176

  • Backport the Template CPT + REST API Controller + templates fetching utilities
  • Backport the block-templates theme support flag and setting.
  • Backport the template loader logic required to render custom block templates for classic themes (not the full logic).

• Widget Editor https://core.trac.wordpress.org/ticket/51506

  • Backport the endpoints.
  • Backport the UI.

• Diverse block editor features (Package update and related changes)

  • Support for the patterns directory https://core.trac.wordpress.org/ticket/53246
  • Last packages update (Gutenberg 10.7) https://core.trac.wordpress.org/ticket/52991
  • Backport the duotone block support server side.
  • Enabling revisions for reusable blocks. https://core.trac.wordpress.org/ticket/53072
  • Update bundled block patterns.
  • Block Styles lazy loading. https://core.trac.wordpress.org/ticket/50328

• Check whether there are any remaining PHP changes that doesn't fall under the items above v9.9.3...v10.7.0-rc.1 (Link to updated with each Gutenberg release until 10.7.0)

Note The last package update currently in trunk corresponds to Gutenberg v10.7.0

[gziolo]

I plan to publish WordPress packages to npm with code for Gutenberg v10.5 today and open a patch in WP core that updates them.

I see several PHP changes applied for v10.4.0...v10.5.0. There is a big list of updated Block Patterns. I believe that it was already backported in WordPress/wordpress-develop@ce50c6a. I will make sure that other changes are included as well, some examples:

• block supports features got some updated
• File block has now PHP file that needs to be manually exposed

[gziolo]

Some updates:

• Gutenberg 10.5 changes landed to WordPress core with Editor: Update WordPress packages from Gutenberg 10.5 wordpress-develop#1226
• I'm looking now at the patch from @aristath that gives an option to load individual block styles for rendered blocks only Allow loading block-styles on render (opt-in) + inlining wordpress-develop#1236
• File block contains now a script that is rendered only on the frontend, but it isn't handled in WordPress core yet. A follow-up patch is required. I will open a standalone ticket for that issue as it needs some thinking. We might need to split the webpack config to handle packages and blocks seperately.

[gziolo]

I'm looking now at the patch from @aristath that gives an option to load individual block styles for rendered blocks only WordPress/wordpress-develop#1236

Done. This patch contains more improvements like inlining CSS styles to avoid a ton of tiny CSS files downloaded in parallel. @aristath plans to share more in the detailed dev note. Awesome work 👏🏻 👏🏻 👏🏻 👏🏻 👏🏻

There might be a follow-up task required in the Gutenberg plugin. We are investigating it today.

That leaves JS handling for the File block on the front end.

We should also have another updated to block editor later this week when Gutenberg 10.6 drops.

[gziolo]

Gutenberg 10.6 synced with WordPress core:
WordPress/wordpress-develop#1257

There are some follow-up items necessary:

• Site Logo block still needs to be exposed on the server with the related logic. @aristath explores alternative handling that doesn't conflict with the unit tests in WordPress core in Use custom_logo theme-mod instead of site_logo setting for the site-logo block #31994
• Post Author block needs to be removed when 10.7 gets synced
• New construct_wp_query_args function needs some sanity check and maybe more structured name. It would be great to add unit tests, cc @ntsekouras.

[gziolo]

I'm about to land renaming construct_wp_query_args to build_query_vars_from_query_block (#32041) in Gutenberg that will have to be applied to WP core as well.

@ntsekouras is planning to look at writing unit tests for build_query_vars_from_query_block. We also need tests for block_has_support and new block supports integrations added.

[youknowriad]

Core has been updated with the packages for Gutenberg 10.7.0 RC and the post author block is not removed from Core.

[youknowriad]

@ntsekouras just included the Query and Social Links block patterns to Core.

[youknowriad]

We landed the theme.json Global settings. @nosolosw and @jorgefilipecosta are focusing on the style part right now.

[youknowriad]

Theme.json infrastructure is now fully backported.

[youknowriad]

And the widgets editor is in :)

[youknowriad]

Template Mode has been merged too.

[youknowriad]

Thanks all for your work here. We got all the big features in. We have a couple smaller remaining issues. Let's now coordinate using the 5.8 Must Haves board. Please take a look there and consider the items there as the highest priorities at the moment.