Xserver corresponds to display :1.0 instead of :0.0

[paul <Paul.Domaskis@gmail.com>]

I have a very simple ~/.startxwinrc:

   xrdb -load $HOME/.Xresources
   xterm -display :0.0 # xterm &
   exec sleep infinity

Recently, I found that the xterm wasn't launching.  I googled, read
some cygwin threads about X authorities, but have to admit, I have a
lot to learn about X windows.  Anyway, since I could open an xterm by
right clicking on the Cygwin/Xserver:1.0 app in the notification area
of Windows 7, I sneakily (OK, it wasn't the craftiest thing in the
world) echo'd $DISPLAY.  Lo, it was 1.0, and the following works fine:

   xterm -display :1.0 &

Yes, I know it says 1.0 in the tip for the Cygwin/Xserver:1.0 app, but
I didn't actually look at that detail until now, as I'm posting.

A google for the following doesn't turn up anything:

   cygwin xterm "-display :0.0" "display :1.0"

I'm wondering if this was a planned change in how X-windows works or
if something is awry with my setup, causing a server with display :0.0
to fail, and making go to :1.0.  I did a browse of the cygin announce
list on gmane (since the X-windows announce list is now obsolete), but
no joy.  And I would have expected anything to show up in my google
search.

Can anyone point me to the description of this change?  If it is not a
deliberate change, what would be a good approach to troubleshoot it?
I have a file ~/.xsession-errors, but it is dated 2015-09-16, and I've
used X-windows plenty since then.


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