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The escape sequences ESC # 3 and ESC # 4 (DECDHL) are meant to be used on pairs on adjacent lines to request double height lines. As an example:

echo -e "\e#3DOUBLE HEIGHT LINE\n\e#4DOUBLE HEIGHT LINE"

Now different terminal emulators behave differently when only a single line is set to double height. xterm happily displays the corresponding half of the double height characters, while konsole displays the whole double height characters.

What did real VTxxx do?

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What did real VTxxx do?

Certainly the VT220 does the same as what xterm does. It just shows the top or bottom half of the character. I don't recall this behaviour depending on the emulation mode.

I'm assuming the other VT's do the same as the VT220. It'd make for much simpler implementation.

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