ctrl-drag in object manager deselects item

[pasbi]

Select some objects in object manager, the press ctrl and drag an item. That item is deselected, the others are dragged.
That item shouldn't be deselected.
Deselect should only happen when the mouse button is released and no drag took place.

[pasbi]

I think this is a bug in Qt. It also happens with a mwe. Just add a ListWidget with some items to your UI. Make sure ListWidget::selectionMode is extended and drag'n'drop is enabled to make the issue appear.