Ah, I understand. Unfortunatly, it seems that allowing the terminal to

wrap itself makes cursor movement unpredictable. Sometimes moving

up/down the wrapped line is seen as one line, sometimes as two.


That would definitely be a bug in your terminal emulator or your cursor handling code. While many parts of the VT102 specification are fairly ambiguous when it comes to wrapping, the consensus (e.g. xterm’s behavior) is to treat wrapped lines as separate lines for the purposes of cursor motion.

The only tricky bit is if your cursor has wrapped off the end of a line but not yet moved to the next (the cursor is in the “margin”); I can explain this special quirk to you a bit more off-list if you’d like.

-Ben
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