It's more of a call of help, then an issue:

dataChanged has, among others, two parameters topLeft, bottomRight which are DosQModelIndex. The question is -- how do I get these indexes? By calling dos_qmodelindex_create and then dos_qmodelindex_sibling? I suppose they won't be valid as they are not connected to the model?

Or maybe, there should be a binding for http://doc.qt.io/qt-5/qabstractitemmodel.html#index or http://doc.qt.io/qt-5/qabstractitemmodel.html#createIndex?