Hi Matt,

> This is a very small patch that I believe fixes a previous, incorrect
> fix for computing the window text area when line numbers are
> present. The previous fix seemed to assume that
> display-line-numbers-width being nil meant that this means line numbers
> are not present. However, it can also mean (as described in the
> variable documentation) that the line number width is computed
> dynamically.

Thanks for this patch. I wasn’t aware of `line-number-display-width' when I wrote
that, but it looks like a better fit than my `(or ... 0)' statement. As such, I’ve
just applied your patch as cd3e138, tweaking the commit message to no longer go
over the maximum length :)

Looking at the docstring for `line-number-display-width', it seems that the
pixelwise mode may be more useful for our purposes, but that improvement can be
in a subsequent patch.

All the best,
Timothy