fix: only change stable row offset if screen has scrollback #6099
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I noticed, that in specific circumstances some lines are moving in a way they are not supposed to in alternate screen mode. Particularly noticeable in neovim.
wezterm_bug_demo.mp4
Turns out, when scrolling in a mux window, the viewport is moved down even if there is not supposed to be a scrollback (like in altenate screen mode). I added a check in the corresponding scroll method.
Together with #5981 this was part of the issues described in #4607.