Command line arguments wrong when quotes used in command path

When quotes are used in paths arguments gets lost in certain cases, reproduced with 5.12.

From a customer:

"I think there's a bug in QCoreApplication::arguments() when dealing with quoted paths to the exe in Windows.

The attached exe prints the contents of QCoreApplication::arguments(). The output is as follows for various invocations of the program. As you can see, sometimes it splits the application path wrongly, and drops the last argument. Note: all these quotings of the application path are valid in Windows, and are executing the application.

D:\stuff\qtcmd>x64\Release\qtcmd.exe hello world

arg=x64\Release\qtcmd.exe

arg=hello

arg=world

D:\stuff\qtcmd>"x64\Release\"qtcmd.exe hello world

arg=x64\Release\

arg=qtcmd.exe

arg=hello

D:\stuff\qtcmd>"x64\Release"\qtcmd.exe hello world

arg=x64\Release

arg=\qtcmd.exe

arg=hello

D:\stuff\qtcmd>"x64\Release\qtcmd.exe" hello world

arg=x64\Release\qtcmd.exe

arg=hello

arg=world"