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I have been seeing the warning of Undefined index in tao_textarea() whenever a textarea form element in a module has something similar to the following:
$form['embedscript'] = array( '#type' => 'textarea', '#attributes' => array('id' => 'embed-content', 'name' => 'embed-content'), '#title' => t('Embed Script'), '#required' => FALSE, '#value' => get_embed_script($data->nid), '#cols' => 60, '#rows' => 12, );
Seems that tao_textarea() directly sets $element['#attributes']['name'] equal to $elements['#name'] which may not always be set since it is not part of fapi documentation. FAPI documentation does however mention using #attribute associative array. Hence I propose the following patch.