The [winfo id] of a Tk window is meant to identify it. The actual value

returned, though, has been a hex-formatted int value -- that is 32 bits.
On OS X Cocoa, the actual Window or XID is not an int but an unsigned
long, and does not fit in 32 bits.  (What's really stored even seems to be
a (MacDrawable *) -- a pointer -- definitely not something 32-bits can capture).
Thus generating [winfo id] loses info, and breaks totally.  Has for a long
time apparently.  There are even explicit comments in place plainly stating
that it is broken and what needs doing to fix it.  
Updated the platform-specific routines Tkp(Scan|Print)WindowId() so that
window id's are no longer lossy and broken in Cocoa Tk.

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