QIODevice.cpp: When loading content to a Widget from a QFile and calling a QFileDialog from the application the dialog goes loop

When loading content to a Widget from a QFile and calling a QFileDialog from the application the dialog goes into a loop when navigating through subfolders.

The following warning appears:
warning: QFile::seek: IODevice is not open

This is caused by calling the following:

 QFile list("foo\\bar");
 if(!list.open(QIODevice::ReadOnly)) {
  ...
  return;
 }

Workaround:

 QFile list("foo\\bar");
 if(!list.open(stderr,QIODevice::ReadOnly)) {
  ...
  return;
 }