Carousel: disable WordPress Core' Lightbox option

projects/plugins/jetpack/changelog/fix-carousel-lightbox-disable

@@ -0,0 +1,4 @@
+Significance: patch
+Type: compat
+
+Carousel: disable WordPress' lightbox option when Jetpack's Carousel feature is activated.

projects/plugins/jetpack/modules/carousel/jetpack-carousel.php

@@ -83,6 +83,9 @@ public function init() {
 		$this->single_image_gallery_enabled            = ! $this->maybe_disable_jp_carousel_single_images();
 		$this->single_image_gallery_enabled_media_file = $this->maybe_enable_jp_carousel_single_images_media_file();
 
+		// Disable core lightbox when Carousel is enabled.
+		add_action( 'wp_theme_json_data_theme', array( $this, 'disable_core_lightbox' ) );
+
 		if ( is_admin() ) {
 			// Register the Carousel-related related settings.
 			add_action( 'admin_init', array( $this, 'register_settings' ), 5 );
@@ -206,6 +209,32 @@ public function maybe_enable_jp_carousel_single_images_media_file() {
 		return apply_filters( 'jp_carousel_load_for_images_linked_to_file', false );
 	}
 
+	/**
+	 * Disable the "Lightbox" option offered in WordPress core
+	 * whenever Jetpack's Carousel feature is enabled.
+	 *
+	 * @since $$next-version$$
+	 *
+	 * @param WP_Theme_JSON_Data $theme_json Class to access and update theme.json data.
+	 */
+	public function disable_core_lightbox( $theme_json ) {
+		return $theme_json->update_with(
+			array(
+				'version'  => 2,
+				'settings' => array(
+					'blocks' => array(
+						'core/image' => array(
+							'lightbox' => array(
+								'allowEditing' => false,
+								'enabled'      => false,
+							),
+						),
+					),
+				),
+			)
+		);
+	}
+
 	/**
 	 * Returns the value of the applied jp_carousel_asset_version filter
 	 *