$element['#suffix'] is overwritten

When adding the img_assist link to the bottom of the textareas (img_assist_textarea and perhaps elsewhere) the $element['#suffix'] is overwritten instead of being appended. This can break other modules that try to add to the suffix to put their own code there.

Change (Line 109):
$element['#suffix'] = $output;
to $element['#suffix'] .= $output;