QProcess start does not handle properly arguments with characters such as ampersands("&"), carets("^") and commas(",")

When a string of a stringlist contains such characters, it is not "quoted" when injected as a command line. To reproduce:

The batch file (C:\ListDir.bat) only has one line to print out the contents of a directory.

dir "%~1"

The Qt code is written like below.

#include <iostream> 
#include <QProcess> 

int main(int argc, char *argv[]) 
{ 
QProcess proc(NULL); 
proc.start("C:\\ListDir.bat", QStringList() << "C:\\Comma,Directory\\ "); 
proc.waitForFinished(-1); 
std::cout << QString(proc.readAllStandardOutput()).toStdString().c_str(); 

return 0; 
} 

As a result the command executed is "dir c:\Comma". the ",Directory" has been "lost" while "dir "c:\Comma,Directory" is a valid windows command.

Problem:
I think in qprocess_win.cpp, function static QString qt_create_commandline(const QString &program, const QStringList &arguments), the problem is that the argument should be quoted whatever characters it contains.