setCursor doesn't work

[Michael Thaler]

Hello,

the crop tool does now recogize if the mouse pointer is over one of the 
handles. I want to change the cursor to a reisze cursor, if the mouse pointer 
is over one of the handles. For this I do the following:

void KisToolCrop::cursor (Q_INT32 handle)
{
        switch (handle)
        {
        case (UpperLeft):
        case (LowerRight):
                kdDebug() << "setCursor(KisCursor::sizeFDiagCursor()) called" 
<< endl;
                setCursor(KisCursor::sizeFDiagCursor());
                return;
        case (LowerLeft):
        case (UpperRight):
                kdDebug() << "setCursor(KisCursor::sizeBDiagCursor()) called" 
<< endl;
                setCursor(KisCursor::sizeBDiagCursor());
                return;
        }
        kdDebug() << "setCursor(KisCursor::selectCursor()) called" << endl;
        setCursor(KisCursor::selectCursor());
        return;
}

This function is actually called correctly and the correct messages are 
printed to the console but unfortunately changing the cursor does not work. 
What is the reason for this?

Michael