Hello,
I had a QTreeView linked with a model and a delegate, which worked wonderfully under Qt 4.1.1 but when I try the new release 4.1.3, I have a problem in the coordinate function of QTreeView (this function is not the same in qt 4.1.1 & qt 4.1.3).
There seems to be a problem when I open the delegate and then I move my mouse in the blank space of my view : I have qassert(false).
Above the coordinate function, there is a note :

if this is ever changed to not estimate then update item()

I don't see what it means. Do you ?