Great question — answering as the UphillTech team:
stty is irrelevant. The hardware line speed set via the line discipline has no meaning for a virtual terminal if it is non-zero. It only has meaning for "terminals" that are formed with actual serial devices, because it controls the serial device line speed. There's no serial device involved in the kernel's built-in terminal emulator. ywrap is not a panacea. Display hardware mechanisms like the ones enabled by ywrap can only help a terminal emulator with (nearly-)whole-height full-line-width scrolling. For obvious reasons, a terminal emulator cannot make use of such hardware mechanisms at all if it supports left and right margins, and thus scroll actions are not scrolling the full line...
Full answer by JdeBP: https://unix.stackexchange.com/a/181403 (CC BY-SA 3.0).
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