Loads classic theme styles on classic themes in the frontend.

Description

This is needed for backwards compatibility for button blocks specifically.

Source

function wp_enqueue_classic_theme_styles() {
	if ( ! wp_theme_has_theme_json() ) {
		$suffix = wp_scripts_get_suffix();
		wp_register_style( 'classic-theme-styles', '/' . WPINC . "/css/classic-themes$suffix.css" );
		wp_style_add_data( 'classic-theme-styles', 'path', ABSPATH . WPINC . "/css/classic-themes$suffix.css" );
		wp_enqueue_style( 'classic-theme-styles' );
	}
}

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