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What?

Provide a new "collaborative-editing" post type support.

Why?

A new post type support adds support for collaborative editing to posts and pages by default and allows custom post types to opt in to collaborative editing.

How?

Use the enabled flag on the entity sync config to signal whether an entity supports collaborative editing.

Testing Instructions

  1. Check out this branch.
  2. Enable the real-time collaboration experiment: Gutenberg > Experiments.
  3. Open a post or page for editing in two different browser environments.
  4. Use your browser's development tools to remove the post editor lock (see screencast in the next section).
  5. Add a code snippet to register a custom post type and enable collaborative editing support.
  6. Repeat steps 3 and 4 to confirm that the custom post type supports collaborative editing.
$args = array(
        'label' => 'recipes',
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'collaborative-editing' ),
        'show_in_rest' => true,
);     
register_post_type( 'Recipe', $args );

Testing Instructions for Keyboard

Note: This provider uses requests to admin-ajax.php for signaling and the initial connection is delayed.

Screenshots or screencast

pr-1.mov

@chriszarate chriszarate added [Feature] Real-time Collaboration Phase 3 of the Gutenberg roadmap around real-time collaboration [Type] Experimental Experimental feature or API. labels Oct 7, 2025
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github-actions bot commented Oct 7, 2025

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If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: chriszarate <[email protected]>
Co-authored-by: Mamaduka <[email protected]>
Co-authored-by: youknowriad <[email protected]>

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github-actions bot commented Oct 7, 2025

Size Change: +39 B (0%)

Total Size: 2.12 MB

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@Mamaduka
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Mamaduka commented Oct 8, 2025

Recently, we began declaring editor-specific feature supports as sub-properties of top-level editor support. I think this would also fall into that category.

Here's the latest example - #71682.

@chriszarate
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Recently, we began declaring editor-specific feature supports as sub-properties of top-level editor support.

My only reservation is future behavior. In theory, it is possible for a post type to lack editor support and still participate in collaborative editing. The only requirement is that is loaded and persisted by the core-data store. For example, if a nav_menu_item was loaded by Gutenberg in some editable form, we would want those edits synced to connected peers.

@Mamaduka
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Mamaduka commented Oct 8, 2025

In theory, it is possible for a post type to lack editor support and still participate in collaborative editing.

If that were the case, then the top-level support key would make more sense. The core-data package can be used outside of editors.

@chriszarate chriszarate force-pushed the add/sync-config-enabled-supports branch from 5343f57 to 984c700 Compare October 8, 2025 17:04
Base automatically changed from improve/sync-entity-config to trunk October 8, 2025 19:12
@youknowriad
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One question I have here is that I have trouble understanding how this support works. Imagine users being in a session (say in the site editor) where some post types support collaborative editing but others not, and they do modifications to both kind of post types, what's the expected behavior here?

@chriszarate
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chriszarate commented Oct 10, 2025

Imagine users being in a session (say in the site editor) where some post types support collaborative editing but others not, and they do modifications to both kind of post types, what's the expected behavior here?

Great question! To me, this question centers around edit locks and making sure they are correctly implemented and respected by every editing mode.

In general, I would want every editing mode to follow these rules:

  1. If an entity does not support collaborative editing, open it for editing and set a lock. If a lock is already held by another user, present the entity in "read-only mode" with a presence indicator to show who holds the lock.
  2. If an entity does support collaborative editing, open it for editing with presence indicators to show who is collaborating.
    a. For backwards compatibility, we probably want to continue to set a lock. Editors that are "collaborative-editing-aware" can ignore it.

Correct me if I'm wrong, but AFAIK the current site editor does not set or respect edit locks. Unintentional overrides are already a problem there. I'm not deeply familiar with the how the site editor works so I'm not sure if I'm suggesting something that will be a huge undertaking.

Are there other current examples of multi-entity-editing besides the site editor?

In our plugin, we currently disable the experiment on the site editor, partially for this reason.

@youknowriad
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Correct me if I'm wrong, but AFAIK the current site editor does not set or respect edit locks.

This is true, even in the post editor it is true. That said when some things are "collaborative" it becomes a bit harder to reason about, because editors have the capacity to open multiple entities from multiple post types at the same time.

I guess in other words, it would have been simpler if we had basic collaborative editing for all entities by default (even if the merging is not optimized properly)

@chriszarate
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Closing the PR for this approach, as changing the loaded context to edit is not workable:
#37685

We can work to add supports to the view context or pursue a filter solution.

@Mamaduka Mamaduka deleted the add/sync-config-enabled-supports branch October 14, 2025 05:03
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[Feature] Real-time Collaboration Phase 3 of the Gutenberg roadmap around real-time collaboration [Type] Experimental Experimental feature or API.

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4 participants