I'm using abstractItemModel / my own item, I ensure that columnCount return correct number of columns, yet it's still wrong.
In regard to using proxyModels, I'd love to use it, but I only found few examples and I'm struggling as to how I would do it. Any hints wold be great, I would prefer to use a proxy instead here.
I literally have no idea how I can simulate setRootIndex with proxyModel, since I need to see parentItem of the item that I wish to set as rootitem and I don't want to see these parent items... here was me early attempt > https://forum.qt.io/topic/102227/qsortfilterproxymodel-simulate-new-root-index/2
@Christian-Ehrlicher I'm totally blaming you for me going this setRootIndex road as I was trying proxy early and you said to use this : p