Feature Request: make HorizontalHeaderView with QAbstractItemModel

As mentioned in https://doc-snapshots.qt.io/qt5-dev/qml-qtquick-controls2-horizontalheaderview.html#model-prop, If model is a QAbstractItemModel , headerData() will not be accessed. But it is better if HeaderView works with QAbstractItemModel too.

for instance, if the user has something like:

TableModel* myModel = new TableModel();
QSortFilterProxyModel* proxyModel = new QSortFilterProxyModel;
proxyModel->setSourceModel(myModel);
engine.rootContext()->setContextProperty("tableModel", proxyModel);

If using a ProxyModel it does no longer refer to headerData() but uses data() instead.