Well do I ever feel like a fool!  I found the problem.  I can't tell the
difference between a lower case L (l) and a numeric one (1).  They look
almost identical in the font chosen by the web page from which I obtained
the escape sequences for "altscreen" and "defscreen"
(http://rtfm.etla.org/xterm/ctlseq.html)  Near the middle of this page
we see the codes for "DEC Private Mode Reset" (DECRST), all of which begin
with

CSI ? Pm l

That's a lower-case "L" at the end there, not a 1.  Can you tell?  I couldn't.
I should have been suspicious about a numeric parameter being terminated by
the numeral one, and I was, but not suspicious enough to try a lower-case "L".
Anyway, when I specify the options as

-altscreen '28x132=\E[?40h\E[?3h' -defscreen '28x80=\E[?3l\E[?40l'

instead of

-altscreen '28x132=\E[?40h\E[?3h' -defscreen '28x80=\E[?31\E[?401'

then this problem goes away.  Can you tell the difference?  It may depend
greatly on which font your e-mail system or web browser uses.  I'll tell
you one thing: the computer can sure tell the difference!  :-(

Unfortunately, this does *NOT* fix bug 507483.  I was hoping that it would,
but it does not.  You may close this bug report as a user error, but leave
bug 507483 open, please.




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