Exceptions in overwritten functions not reported reliably

Sometimes I found that I overwrote a native method (e.g. `paintEvent` or `sizeHint`) and had a typo in it. It would just exit the function and return a value as if the override didn’t exist.

Find the attached example of a custom QStyledItemDelegate where sizeHint is overwritten and a function is called that does not exist. Launching the application will have the cells in their default size. “sizeHint 1” is printed, “sizeHint 2” is not because the function was quit in the mean time.

No exception or warning is printed.

(In this particular instance a warning is printed when resizing the window but not initially)