[Interest] dragLeaveEvent never called & nested widget class

[Etienne Sandré-Chardonnal]

Dear all,

I had a problem on a custom widget, where reimplemented dragEnterEvent and
dropEvent were properly called, but dragLeaveEvent was never called.

The event handling function were reimplemented in a "LinkWidget" class, and
then a ParameterWidget::LinkRefWidget was subclassing LinkWidget.

After many tries for making a MCVE, I figured out that un-nesting
LinkRefWidget was solving the issue.

Is this a bug, or is nesting QWidget subclasses officially unsupported?

Thanks!
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