VLC 4: Dragging item to playqeue adds it twice

Dragging an item to the playqeue adds it twice. Using Media → Open File... instead only adds it once, as expected.

changed milestone to %Qt redesign (VLC 4.0)

added Component::Interface: Qt label

I think this is an old bug @chub pointed to me that just reappeared or was never tested on Windows if it was fixed.

The problem is that both the QML side and the Qt backend handles the file drop operation.

I previously added the following line to prevent this behavior (it intends to make the backend ignore the action) but apparently it didn't work out on Windows.

https://code.videolan.org/videolan/vlc/-/blob/master/modules/gui/qt/playlist/qml/PlaylistListView.qml#L81 drop.accept(Qt.IgnoreAction);

https://code.videolan.org/videolan/vlc/-/blob/master/modules/gui/qt/maininterface/main_interface.cpp#L602

void MainInterface::dropEvent(QDropEvent *event)
{
    dropEventPlay( event, true );
}

mentioned in merge request !239 (merged)

closed with merge request !239 (merged)

changed milestone to %4.0