Keith's commit to make xnest use mipointer instead of midispcur left
xnestConfineWindow unused:

2004-08-11  Keith Packard  <keithp@keithp.com>

        * programs/Xserver/hw/xnest/Cursor.c: (xnestSetCursor),
        (xnestMoveCursor):
        * programs/Xserver/hw/xnest/Events.c: (ProcessInputEvents),
        (xnestCollectEvents):
        * programs/Xserver/hw/xnest/GCOps.c: (xnestPushPixels):
        * programs/Xserver/hw/xnest/Screen.c: (xnestOpenScreen):
        * programs/Xserver/hw/xnest/XNCursor.h:
        Xnest was half-using midispcur and doing a bad job of it.
        Replace all of that code with mipointer which does a lot of the
        work.

Attaching trivial patch to remove it