Don't make assumptions about current line number when displaying commit

autoload/fugitive.vim

@@ -2096,6 +2096,7 @@ function! fugitive#BufReadCmd(...) abort
           call s:ReplaceCmd([dir, 'cat-file', b:fugitive_type, rev])
         else
           call s:ReplaceCmd([dir, 'show', '--no-color', '-m', '--first-parent', '--pretty=format:tree%x20%T%nparent%x20%P%nauthor%x20%an%x20<%ae>%x20%ad%ncommitter%x20%cn%x20<%ce>%x20%cd%nencoding%x20%e%n%n%s%n%n%b', rev])
+          keepjumps 1
           keepjumps call search('^parent ')
           if getline('.') ==# 'parent '
             silent keepjumps delete_