patch 9.0.1483: += operator does not work on class member Commit: https://github.com/vim/vim/commit/22363c69945e48a7496f0ae00bc06235084ddd7a Author: Bram Moolenaar <Bram@vim.org> Date: Mon Apr 24 17:15:25 2023 +0100 patch 9.0.1483: += operator does not work on class member Problem: += operator does not work on class member. Solution: Do not skip as if "this." was used. (Christian Brabandt, closes #12263)

" Vim filetype plugin
" Language:	Dockerfile
" Maintainer:   Honza Pokorny <http://honza.ca>
" Last Change:	2014 Aug 29

" 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

let b:undo_ftplugin = "setl commentstring<"

setlocal commentstring=#\ %s