KMultiTabBarButton lost a slot between 3.5 and 4.0

[Albert Astals Cid]

I just discovered that KMultiTabBarButton in KDE 4 does not have the setText 
slot as it had in 3.5, that makes 
kdebase/apps/konqueror/sidebar/sidebar_widget.cpp do wrong connects in code 
that has not changed in ages, and will probably happen in other places.

What do we do? Add the slot asap? And will it work with 
QAbstractButton::setText being not virtual? Or do we just add a big warning 
in the class and in KDE4PORTING.HTML saying that this slot was removed?

Albert