When enabled the first starting position of any application window shall be in the center of the current screen. NO LONGER UPDATED! If you have 3.14 or higher gnome-shell, then using dconf-editor go to /org/gnome/mutter/, and check 'center-new-windows'.
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The change is intended to handle multiple monitors where the current monitor is not always one and the same. A simple change with, hopefully, great utility. Also a bump in version numbers.
Place Windows In Center