Cover/Accordion: Exit on Enter

[ocean90]

What?

Closes #77294.

This PR adds the __experimentalOnEnter support key like done in 223baa2 and already used by other blocks: https://github.com/search?q=repo%3AWordPress%2Fgutenberg+__experimentalOnEnter+language%3AJSON&type=code&l=JSON

Why?

It solves the problem of not be able to exit the block by pressing enter, it only adds empty paragraphs.

How?

Adding __experimentalOnEnter to supports config in block.json.

Testing Instructions

1. Add a Cover block
2. Select a color and enter some text for the first paragraph
3. Click enter twice

Testing Instructions for Keyboard

Screenshots or screencast

Bildschirmaufnahme.2026-04-14.um.11.08.53.mov

Use of AI Tools

None.

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[ocean90]

@ellatrix Do you think adding __experimentalOnEnter for these blocks is also a good idea?

[jasmussen]

Thanks for the PR, thanks for the ping. It can be hard to keep up with everything, appreciate your patience; if you find a PR stuck in the future, consider pinging also @WordPress/gutenberg-design, for gut-checks. The group can often expand ping ranges too, if need be.

In this case, I agree with the change. It's very simple, uses an existing (if private) API, and it solves a reasonable problem. There isn't really a compelling layout you can achieve with empty linebreaks (that without spaces inside collapse on the frontend anyway). On the other hand, this change fixes a problem where if the only block you've inserted is a cover block, you can't exit it with keyboard only (in part introduced in #76568). With this PR, you can.

[jasmussen]

Tentative green light. I'd appreciate a second voice before you merge.