Breaks remembering last line

Noticed that this code for remembering what line and returning when reopening the file does not work with Goyo enabled:

``` vimscript
" Uncomment the following to have Vim jump to the last position when
" reopening a file
if has("autocmd")
au BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$") | exe "normal! g'\"" | endif
endif
```

Start by reproducing the reported behavior in Vim with Goyo enabled and the shown BufReadPost autocmd. Confirm that reopening a file restores the last cursor line, including when Goyo is active; the issue does not name a file or test to inspect.

Written by the indexing model from the issue text.