QProcess does not provide an API for STARTUPINFO on Windows, so it's impossible to pass a windows position/size/state to the new process.

It would be cool to be able to modify this information before the child process gets started (an API similar to setupChildProcess?). Alternatively, an API to set the initial position/size/state of the main window of the child process would be quite handy, but I don't know if this would be feasibly in a portable way (maybe passing -geometry for X11, but what's about the other platforms?).