patch 9.0.0901: setting w_leftcol and handling side effects is confusing Commit: https://github.com/vim/vim/commit/0c34d562647f029faca40f7733ccfb7b5377672b Author: Bram Moolenaar <Bram@vim.org> Date: Fri Nov 18 14:07:20 2022 +0000 patch 9.0.0901: setting w_leftcol and handling side effects is confusing Problem: Setting w_leftcol and handling side effects is confusing. Solution: Use a function to set w_leftcol() and handle side effects.

" Vim filetype plugin
" Language:        Jsonnet
" Maintainer:      Cezary Drożak <cezary@drozak.net>
" URL:             https://github.com/google/vim-jsonnet
" Last Change:     2022-09-08

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

setlocal commentstring=//\ %s

let b:undo_ftplugin = "setlocal commentstring<"