problem with QFileSystemWatcher

I have made a little app to test QFileSystemWatcher.I have problems with it:
If I create a new folder "folder" (a subdirectory of the directory that I monitor) and I rename it "folder2" and then rename it again "folder" the QFileSystemWatcher doesn't emit a directorychanged signal and I cannot detect changes within this folder too.
I create or rename a subdirectory in a directory that I monitor...the problem is that if the directory that I rename take a name that has already existed before it does'nt detect the change of the subdirectory although it detects the change in the parent folder...
Is it possible to fix QFileSystemWatcher ? because I need it in several apps.