Cursor up and down should be limited by the scroll region (cuu should stop at the scroll region top if starting from below it and cud stop at the bottom if starting from above). Fixes another vttest test.
Cursor up and down should be limited by the scroll region (cuu should stop at
the scroll region top if starting from below it and cud stop at the bottom if
starting from above). Fixes another vttest test.


klaxalk/tmux,klaxalk/tmux,klaxalk/tmux,klaxalk/tmux,klaxalk/tmux