settings.php

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<?php
$widget = elgg_extract('widget', $vars);

// not using elgg_view_form() so that we can detect if the form is empty
$form_body = elgg_view('forms/widgets/save', $vars);
if (!$form_body) {
    return true;
}

$additional_class = preg_replace('/[^a-z0-9-]/i', '-', "elgg-form-widgets-save-{$widget->handler}");

$form = elgg_view('input/form', array(
    'action' => 'action/widgets/save',
    'body' => $form_body,
    'class' => "elgg-form-widgets-save $additional_class",
));
?>

<div class="elgg-widget-edit" id="widget-edit-<?php echo $widget->guid; ?>">
    <?php echo $form; ?>
</div>