Bug 142237

Version:           1.5.6 (using KDE 3.5.6 "release 19.1" , openSUSE )
Compiler:          Target: i586-suse-linux
OS:                Linux (i686) release 2.6.18.2-34-default

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Reproduction procedure:
=======================
1. Open class diagram
2. Create two classes
3. Add containment relationship between them
4. Umbrello crashes

============
Stack trace:
============
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1233639728 (LWP 30642)]
[KCrash handler]
#9  0x0810af49 in UMLObject::setUMLPackage ()
#10 0x081d76b0 in ToolBarStateAssociation::addAssociationInViewAndDoc ()
#11 0x081d78f7 in ToolBarStateAssociation::setSecondWidget ()
#12 0x08111704 in ToolBarState::mouseRelease ()
#13 0xb70d9f21 in QScrollView::viewportMouseReleaseEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#14 0xb70d71ff in QScrollView::eventFilter ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#15 0xb6fc1ccc in QObject::activate_filters ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#16 0xb6fc1d3b in QObject::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#17 0xb6ffae3c in QWidget::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#18 0xb6f63647 in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#19 0xb6f64641 in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#20 0xb75ec2b2 in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#21 0xb6f030f7 in QETWidget::translateMouseEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#22 0xb6f0201f in QApplication::x11ProcessEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#23 0xb6f1291a in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#24 0xb6f7a0e0 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#25 0xb6f79f76 in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#26 0xb6f6300f in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#27 0x081beb9c in main ()