Will see what we can do here. Is seems that bootstrap-select supports this feature, but I need to find out how to enable it ?

Ok I found it, but it really does not help, because input is too short.
In fact currently our select lists have checkmark on selected options, but icon is in Bootstrap 3 format, so it is not visible :(
<span class="glyphicon glyphicon-ok check-mark"></span>

Thanks for investigate Issue and taken Time, @b2z

@franz-wohlkoenig Would you mind if we leave this open?
I believe that it's still an issue - and @b2z didn't say that it can't be fixed ?

@elkuku do you have an idea how to fix it?

@elkuku do you have an idea how to fix it?

Not the slightest clue ?

But I believe that somebody might open another issues for this bug.
Also we might hope that some community member with better CSS abilities might step up and help us out?

IMHO this is a serious usability issue and we shouldn't just close it as "wont fix" - at least in my opinion ?