To Drag and Drop setDropAction(Qt::moveAction) in dragMoveEvent and dragEnterEvent is not necessary.

[whitesong]

I've tested a project for Drag and Drop but when i dont write
@setDropAction(Qt::moveAction)@
in
@dragMoveEvent(...)@
and
@dragEnterEvent(...)@

project still work, i saw many projects with this line and i dont know why a professional programmer write this code?(you can see many examples that wrote this line in their code)