wp_script_is() returns false for scripts enqueued via dependencies.

[mikejolley]

Register/enqueue a script with dependencies, e.g.

wp_enqueue_script( 'wc-cart', $src, array( 'jquery', 'wc-country-select' ), $version, true );

With the above example I've enqueued wc-cart and, via a dependency, wc-country-select. The problem is:

wp_script_is( 'wc-country-select', 'enqueued' );

will always return false. This is due to the query method in the WP_Dependencies class not checking the dependencies of each enqueued handle.

IMO this should return true. The script is enqueued via dependency - without a way to check this I cannot conditionally localize my scripts without checking all dependencies.

Fix will be attached.

[mikejolley]

Patch for #28404

[SergeyBiryukov]

Minor edit to avoid deep nesting

[wonderboymusic]

In 29252:

wp_script_is( ..., 'enqueued' ) needs to check dependencies recursively - a single item's dependencies may only be a subset of the full dependency tree. Adds a new method on WP_Dependencies called ->recurse_deps().

Adds unit test.

Props wonderboymusic, SergeyBiryukov, mikejolley.
Fixes #28404.