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✏️ Editing: meta-box-footer.php

<?php
/**
 * Footer meta box, common to one or more modules.
 *
 * @since 3.2.0
 * @package WP_Smush
 *
 * @var \Smush\App\Abstract_Page $this
 */

if ( ! defined( 'WPINC' ) ) {
	die;
}

$current_tab = $this->get_slug();
$button_msg  = 'smush-bulk' === $current_tab ? '' : __( 'Saving changes...', 'wp-smushit' );
$button_text = __( 'Save changes', 'wp-smushit' );

/**
 * Filter to enable/disable submit button in integration settings.
 *
 * @param bool $show_submit Should show submit?
 */
$disabled = 'smush-integrations' === $current_tab ? apply_filters( 'wp_smush_integration_show_submit', false ) : false;

if ( 'smush-cdn' === $current_tab && ! WP_Smush::get_instance()->core()->mod->cdn->get_status() ) {
	$button_text = __( 'Save & Activate', 'wp-smushit' );
	$button_msg  = __( 'Activating CDN...', 'wp-smushit' );
}
?>

MR SKB