"Included email values" component tree is not being indented correctly when there is more than one level

The following form component tree (two levels):

Is not formatted correctly at the Included email values section:

This happens because the number of indentation marks for all children is always 1. And the reason of this is that the regular expression that removes the hyphens of each children component removes them in a single replacement. This is done at includes/webform.components.inc at :

$indents = 0;
$label = preg_replace('/^([\-])+/', '', $label, -1, $indents);

In the above line, if $label is "--Textfield", $indents will not get a value of 2, but a value of 1 as the hyphens are all matched as a single group.

A patch is being attached in the next comment.