Remove auto-renewal checkbox when discount code is entered. Should fix https://github.com/strangerstudios/pmpro-auto-renewal-checkbox/issues/7

my_pmproarc_remove_checkbox_with_discount_code.php

<?php

// Copy from below here

function my_pmproarc_remove_checkbox_with_discount_code() {
	?>
	<script>
	jQuery(document).ready(function() {			
		// After any AJAX call...
		jQuery( document ).ajaxComplete(function() {
			// If the current discount code was updated...
			if( jQuery ( "#pmpro_level_cost p" ).length > 1) {
				// Hide auto-renewal checkbox
                jQuery('#autorenew').prop('checked', true );
                jQuery('#pmpro_autorenewal_checkbox').remove();
                <?php $_REQUEST['autorenew_present'] = 1; ?>
			}
		});
	});
	</script>
	<?php
}
add_action( 'pmpro_checkout_boxes', 'my_pmproarc_remove_checkbox_with_discount_code' );