fix: error when window width is extremely small

[eki3z]

The function window-max-chars-per-line may return -1 if the width of the current window is extremely small. When -1 is passed as the width value to make-list, it results in an error. We must ensure that the value is non-negative before passing it.

[purcell]

Thanks, good catch! Would you mind moving the (max ...) so that it applies to the (window-max-chars-per-line) call a few lines above? I think it would make it clearer where the -1 might come from. (If it's not convenient for you to do so, I can also make the change on your behalf, just let me know.)

[eki3z]

@purcell finished, please check it !

[purcell]

Perfect, thanks!