Cannot drag children of QTreeView when first column is hidden

[kazaak]

Thank you Grandmaster Wysota that did it!

I did implement a custom model (inherited QAbstractItemModel) and create my own tree item class to manage the parent/child relationship. Is the first column therefore used by the view or delegate?

[wysota]

I'm not sure I understand your question. If the column is visible then it is "used" by the view and the delegate. If it is hidden by the model itself, the view and the delegate know nothing about it.