Environment

Windows 10.0.18363.0
tmux over ssh in cygwin

Steps to reproduce

1. Attach to tmux session
2. Fill the screen for example with echo test multiple times
3. Keep printing test, you should alternate with some different text to see if console is scrolled properly.

Expected behavior

Whole screen buffer is redrawn

Actual behavior

Only first line in terminal is redrawn, the rest of the screen space is static and doesn't update while it should. If the output is one line (i.e without new line). If I do echo 'test\n' whole screen is properly redrawn.

Bisect result

This is regression from this commit ca33d89 before that everything was working fine.

// CC @miniksa