Change matchadd to textwidth + 1
Change matchadd to textwidth + 1

Since I'm using the Error highlight group to color the matchadd for
lines longer than textwidth, it makes sense to highlight the character
at textwidth + 1 instead of just textwidth (since that is the first
*erroneous* character).

A quick conditional is needed for textwidth=0, since we don't want the
first column to be highlighted in that case.

igemnace/vim-config,igemnace/vim-config,igemnace/my-vim-config,igemnace/vim-config