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function get_default_block_editor_settings() {
	// Media settings.

	// wp_max_upload_size() can be expensive, so only call it when relevant for the current user.
	$max_upload_size = 0;
	if ( current_user_can( 'upload_files' ) ) {
		$max_upload_size = wp_max_upload_size();
		if ( ! $max_upload_size ) {
			$max_upload_size = 0;
		}
	}

	/** This filter is documented in wp-admin/includes/media.php */
	$image_size_names = apply_filters(
		'image_size_names_choose',
		array(
			'thumbnail' => __( 'Thumbnail' ),
			'medium'    => __( 'Medium' ),
			'large'     => __( 'Large' ),
			'full'      => __( 'Full Size' ),
		)
	);

	$available_image_sizes = array();
	foreach ( $image_size_names as $image_size_slug => $image_size_name ) {
		$available_image_sizes[] = array(
			'slug' => $image_size_slug,
			'name' => $image_size_name,
		);
	}

	$default_size       = get_option( 'image_default_size', 'large' );
	$image_default_size = in_array( $default_size, array_keys( $image_size_names ), true ) ? $default_size : 'large';

	$image_dimensions = array();
	$all_sizes        = wp_get_registered_image_subsizes();
	foreach ( $available_image_sizes as $size ) {
		$key = $size['slug'];
		if ( isset( $all_sizes[ $key ] ) ) {
			$image_dimensions[ $key ] = $all_sizes[ $key ];
		}
	}

	// These styles are used if the "no theme styles" options is triggered or on
	// themes without their own editor styles.
	$default_editor_styles_file = ABSPATH . WPINC . '/css/dist/block-editor/default-editor-styles.css';

	static $default_editor_styles_file_contents = false;
	if ( ! $default_editor_styles_file_contents && file_exists( $default_editor_styles_file ) ) {
		$default_editor_styles_file_contents = file_get_contents( $default_editor_styles_file );
	}

	$default_editor_styles = array();
	if ( $default_editor_styles_file_contents ) {
		$default_editor_styles = array(
			array( 'css' => $default_editor_styles_file_contents ),
		);
	}

	$editor_settings = array(
		'alignWide'                        => get_theme_support( 'align-wide' ),
		'allowedBlockTypes'                => true,
		'allowedMimeTypes'                 => get_allowed_mime_types(),
		'defaultEditorStyles'              => $default_editor_styles,
		'blockCategories'                  => get_default_block_categories(),
		'isRTL'                            => is_rtl(),
		'imageDefaultSize'                 => $image_default_size,
		'imageDimensions'                  => $image_dimensions,
		'imageEditing'                     => true,
		'imageSizes'                       => $available_image_sizes,
		'maxUploadFileSize'                => $max_upload_size,
		// The following flag is required to enable the new Gallery block format on the mobile apps in 5.9.
		'__unstableGalleryWithImageBlocks' => true,
	);

	$theme_settings = get_classic_theme_supports_block_editor_settings();
	foreach ( $theme_settings as $key => $value ) {
		$editor_settings[ $key ] = $value;
	}

	return $editor_settings;
}