Convert QFileInfo to QDir/QFile

Hello, this code:

        if(!source.isReadable() || !source.isExecutable() || !source.exists() || !source.isDir())
	//no error
        QDir tempDir(source.absoluteFilePath());
        if(!tempDir.isReadable() || !tempDir.exists())
        //error

Bug under linux when under KDE I put: ééé as name for folder. And I can't select as folder. Under Qt it show don't displayable char (the ? char).
This is specific tu problem to convert QFileInfo to QDir/QFile (yes QFile is affected too). If I have this conversion, that's allow Qt to bypass the encoding problem and allow the copy of file with encoding problem.
Keep the wrong char into the QString is a way too.
This bug is only into specific case (see env).

My request: do the creator: QFile(QFileInfo) QDir(QFileInfo), by using file pointer, not QString to prevent problem.