[aaronrobertshaw]

Backport of Gutenberg PR WordPress/gutenberg#86640

Trac ticket: https://core.trac.wordpress.org/ticket/66667

Styles in a custom block state, such as Navigation Link's -current, now stay scoped to that state. This covers features with their own selector. Before, they applied to every instance of the block, and -current:hover lost its :hover.

This PR backports:

• state-scoped feature selectors for custom state and custom state pseudo nodes in WP_Theme_JSON::get_block_nodes(),
• the new WP_Theme_JSON::append_to_feature_selectors() helper, also used by pseudo state nodes with no output change,
• and the accompanying WP_Theme_JSON tests.

Testing instructions

Navigation Link has no feature selectors in Core yet, so a filter adds one. No editor or package update is needed.

1. Activate Twenty Twenty-Five and add this mu-plugin:

<?php
add_filter( 'block_type_metadata', function ( $metadata ) {
	if ( 'core/navigation-link' === $metadata['name'] ) {
		$metadata['selectors']['dimensions'] = '.wp-block-navigation-link';
	}
	return $metadata;
} );

add_filter( 'wp_theme_json_data_theme', function ( $theme_json ) {
	return $theme_json->update_with( array(
		'version' => 3,
		'styles'  => array(
			'blocks' => array(
				'core/navigation-link' => array(
					'-current' => array(
						'color'      => array( 'text' => 'red' ),
						'dimensions' => array( 'minWidth' => '200px' ),
						':hover'     => array( 'dimensions' => array( 'minHeight' => '60px' ) ),
					),
				),
			),
		),
	) );
} );

2. Give the Sample Page (ID 2) a Navigation block that links to itself:

wp post update 2 --post_content='<!-- wp:navigation --><!-- wp:navigation-link {"label":"Sample Page","type":"page","id":2,"kind":"post-type"} /--><!-- /wp:navigation -->'

3. View the Sample Page on the front end and search the page source for color: red, min-width: 200px and min-height: 60px. With this PR:

:root :where(.wp-block-navigation .current-menu-item){color: red;}
:root :where(.wp-block-navigation-link:is(.wp-block-navigation .current-menu-item)){min-width: 200px;}
:root :where(.wp-block-navigation-link:is(.wp-block-navigation .current-menu-item):hover){min-height: 60px;}

4. On trunk, the last two rules lose the state and :hover, so every link gets both sizes:

:root :where(.wp-block-navigation .current-menu-item){color: red;}
:root :where(.wp-block-navigation-link){min-width: 200px;}
:root :where(.wp-block-navigation-link){min-height: 60px;}

Use of AI

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5.5
Used for: The port, tests and output check were done by Claude Code; I reviewed them.

[github-actions]

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[github-actions]

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