Saving toolbar state

[Vladimir Prus]

Hello,
there's a bug:

   http://bugs.kde.org/show_bug.cgi?id=117779

that says that if you right click on toolbar, hide debuggers toolbar, and
restart KDevelop, debugger toolbar magically reappears. Unfortunately, I
don't understand how toolbars visibility state is saved at all. All I could
find is:

   class MainWindowShare {

        KToggleAction*   m_toggleBuildToolbar;
   }

but that KToggleAction is initialized to 0 in constructor, and never changed
anywhere. 

So, can somebody explain how existing toolbars visibility state is saved.

Thanks,
Volodya