Multiple QGLWidgets with bitmap cursor problem

Application hangs when we use bitmap cursor.

To simulate we used Qt OpenGL/textures example and added two lines in mouse move method:

void GLWidget::mouseMoveEvent(QMouseEvent *event)
{
QPixmap cur(32,32);
cur.fill(Qt::red);
setCursor(QCursor(cur,0,0));
[...]

Try to rotate cube in one QGLWidget for few second and than try to rtate cube in other QGLWidget.