BeginInsertRow/EndInsertRow/BeginRemoveRow etc - keeps resetting expanded items states?

[Dariusz]

Hey

So I'm working on QAbstractItemModels to build up QTreeView. I'm hand managing all the insert/remove/append/remove rows. I initially built it "as is " and lately I read up that I need to add begin/end routines before and after inserting rows. Now without it, it seemed to work fine, but now with it whenever I drag/drop items, the expanded items close down and so on, entire views gets reset. Is that normal? How can I preserve expanded items or am I doing something wrong?

For example, if I have

    nodeA->appendItem(someNode);
    appendItem(myNode *node){
        if(model){
            model->beginInsertingRows()
        }
        children.push_back(node)
        if(model){
            model->endInsertingRows()
        }
    }

This is routine more or less, but these model-> signals keeps reseeting my expanded items? Or do we dont use these signals if we use our own drag/drop/model/view etc?