>>> Is there a way to manually set terminal size with ANSI escape
>>> sequences?
>> There is nothing in X3.64 (well, in the notes I took when reading it
>> over) that explicitly has such an effect [...]
> There are escape sequences (in VT100 anyway, not sure if they are
> also in X3.64)

Not as far as I can tell from the notes I took.  The sequence in
question is CSI firstline ; lastline r (firstline defaults to 1,
lastline defaults to the last line on the screen), and it is not
described in the X3.64 notes I have.  I believe it's a DECism.
(Actually, I think the VT100 is 7bit; if so, it has to be the ESC [
7-bit form, it can't be the 8-bit CSI C1 character.)

I really should have thought of it myself, just the same.

> which define a "window": Only character cells within that window can
> be changed and the cursor cannot be moved outside.

I don't think that's quite how it works.  What indications I find
indicate that the cursor can be moved outside the scrolling region if
relative origin mode is clear; this is parameter ?6 to the CSI ... h
and CSI ... l sequences.

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