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In Emacs environment, whenever I scroll in one of the windows in split screen, the text from one window wraps around and ends up in the other one.
Unfortunately I can't reproduce this. What is your sequence of terminal emulators (e.g. xterm -> mosh -> screen -> emacs)? Is the damage permanent (it stays forever if you don't hit anything else) or just transient?
The sequence is GNOME Terminal -> mosh -> emacs
So I see the following:https://lh6.googleusercontent.com/-R49Lk8jTY_I/T4nulO8o-qI/AAAAAAAANSQ/oCN-ntiPaOY/s1152/mosh-emacs-split-screen-issue.png
However on Ctrl+L the problem goes away temporarily but when I scroll again the problem is back.
I believe the problem should be fixed as of bfa0999 (currently on master branch) -- could you please test again? You will need to be running this code on the server.
Closing this bug as we believe the problem has been fixed.