Disabled Optgroups still show the optgroup header and divider

[msct]

Currently when I disable an optgroup the options are hidden (using the data-hide-disabled option), but the optgroup header and divider are still displayed.

I would expect that when we disable (and subsequently hide) optgroups, that their header and divider are hidden as well. But that is not the case.

<optgroup label="Child Sizes" class="optgroup-child" disabled>

or

$("select.select-size optgroup.optgroup-child").prop("disabled", true);
$("select.select-size").selectpicker('refresh');