QFileSystemWatcher cannot removePath() on files from watched directory

#include <QtCore/QCoreApplication>
#include <QFileSystemWatcher>
#include <QDebug>
#include <QStringList>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QFileSystemWatcher* w = new QFileSystemWatcher;


    w->addPath("D:\\Pictures\\16225777_500.jpg");
    w->addPath("D:\\Pictures");    // comment to "fix"

    qDebug()<<w->files();   // expected: ("D:\\Pictures\\16225777_500.jpg")

    w->removePath("D:\\Pictures");     // does not help!
    w->removePath("D:\\Pictures\\16225777_500.jpg");    //*** should remove the path



    qDebug()<<w->files();// ***unexpected: ("D:\\Pictures\\16225777_500.jpg")

    return a.exec();
}