QFileSystemModel: how can I be notified of directory listing updates?

[ChrisW67]

I think the reference is to QTreeView::sortByColumn() but I am still having trouble seeing a problem that needs solving. For example, this works just fine for me;

#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QFileSystemModel f;
    f.setRootPath("/");
 
    QSortFilterProxyModel proxy;
    proxy.setSourceModel(&f);
    proxy.setDynamicSortFilter(true);
 
    QTreeView t;
    t.setModel(&proxy);
    t.sortByColumn(0, Qt::DescendingOrder);
    QModelIndex idx = proxy.mapFromSource(f.index("/usr/include"));   
    t.setRootIndex(idx);
    t.show();
 
    return app.exec();
}

#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QFileSystemModel f;
    f.setRootPath("/");

    QSortFilterProxyModel proxy;
    proxy.setSourceModel(&f);
    proxy.setDynamicSortFilter(true);

    QTreeView t;
    t.setModel(&proxy);
    t.sortByColumn(0, Qt::DescendingOrder);
    QModelIndex idx = proxy.mapFromSource(f.index("/usr/include"));   
    t.setRootIndex(idx);
    t.show();

    return app.exec();
}

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Even on large folders the files are always sorted correctly.