Show groupHeading when searching/filtering

[donar-github]

It would be very useful if the group heading was filtered (displayed) during the search as long as child elements (of optgroup) were found.

[Bakual]

I would second this request.
I have a list with similar entries in different groups. When filtered, it is a bit hard to select the correct one when the group heading isn't shown anymore.
Maybe the groupname could also shown behind the entry, hidden by default, but visible if the list is filtered.