[Qt-interest] Setting a different drop action on a QDropEvent is ignored in a QAbstractItemView (Bug?)

[Stephen Kelly]

Hi,

I am working on a custom model and view based on
Akonadi::Collection{Model,View}:

http://websvn.kde.org/trunk/KDE/kdepimlibs/akonadi/collectionview.cpp?view=markup

I'm hitting a problem in dropEvent in the view. The dropAction is set to
Qt::MoveAction, and the event is passed down to the QTreeView. The problem
is that the event->proposedAction is not changed from Qt::CopyAction. This
is as described in the docs: 

http://doc.trolltech.com/4.4/qdropevent.html#dropAction

The problem is that QAbstractItemView::dropOn uses:

    if (model->supportedDropActions() & event->proposedAction()) {

to determine how to deal with the drop. I think it should use:

    if (model->supportedDropActions() & event->dropAction()) {

to allow changing the event action. Is this a Qt bug, or am I missing
something?

Thanks,

Steve.