Gravity Forms: Add field type class to every gfield

gfield-type-class.php

<?php

// Make every gravity form field add its input type as a class. 
// Example (added class: gfield-type-radio):
// fieldset id="field_136_31" class="gfield gfield-type-radio ..."
// Some other types: name, email, html, select, ...
function aa_add_input_type_gravity_forms( $form ) {
	foreach ( $form['fields'] as $field ) {
		if ( $field instanceof GF_Field ) {
			$field->cssClass .= 'gfield-type-' . $field->get_input_type();
		}
	}
	
	return $form;
}
add_filter( 'gform_pre_render', 'aa_add_input_type_gravity_forms' );