Major Description
In a folder's property dialog, Windows calculates the folder size in a background thread so the shell isn't blocked. ROS does this in the foreground thread.
People sometimes have folders with many, many files (such as a terabyte of music) which can take minutes to calculate the size of. The shell being non responsive for this time is unacceptable.
Patch pushes the calculation to a background and updates the dialog once every half second.