Unset dependencies for conditional scripts.

Prevent dependencies from being added when only required by a conditional script or style.

Author: joedolson

src/wp-includes/class-wp-scripts.php

@@ -792,6 +792,10 @@ public function add_data( $handle, $key, $value ) {
 			return false;
 		}
 
+		if ( 'conditional' === $key ) {
+			$this->registered[ $handle ]->deps = array();
+		}
+
 		if ( 'strategy' === $key ) {
 			if ( ! empty( $value ) && ! $this->is_delayed_strategy( $value ) ) {
 				_doing_it_wrong(

src/wp-includes/class-wp-styles.php

@@ -346,6 +346,28 @@ public function print_inline_style( $handle, $display = true ) {
 		return true;
 	}
 
+	/**
+	 * Overrides the add_data method from WP_Dependencies, to allow unsetting dependencies for conditional styles.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param string $handle Name of the item. Should be unique.
+	 * @param string $key    The data key.
+	 * @param mixed  $value  The data value.
+	 * @return bool True on success, false on failure.
+	 */
+	public function add_data( $handle, $key, $value ) {
+		if ( ! isset( $this->registered[ $handle ] ) ) {
+			return false;
+		}
+
+		if ( 'conditional' === $key ) {
+			$this->registered[ $handle ]->deps = array();
+		}
+
+		return $this->registered[ $handle ]->add_data( $key, $value );
+	}
+
 	/**
 	 * Determines style dependencies.
 	 *