patch 8.2.3759: quickfix buffer becomes hidden while still in a window Commit: https://github.com/vim/vim/commit/78a61068cf2c83e611d954a0fb413a09ad59dc07 Author: Yegappan Lakshmanan <yegappan@yahoo.com> Date: Wed Dec 8 20:03:31 2021 +0000 patch 8.2.3759: quickfix buffer becomes hidden while still in a window Problem: Quickfix buffer becomes hidden while still in a window. Solution: Check if the closed window is the last window showing the quickfix buffer. (Yegappan Lakshmanan, closes #9303, closes #9300)

" Vim compiler file
" Compiler:	csslint for CSS
" Maintainer: Daniel Moch <daniel@danielmoch.com>
" Last Change: 2016 May 21

if exists("current_compiler")
  finish
endif
let current_compiler = "csslint"

if exists(":CompilerSet") != 2		" older Vim always used :setlocal
  command -nargs=* CompilerSet setlocal <args>
endif

CompilerSet makeprg=csslint\ --format=compact
CompilerSet errorformat=%-G,%-G%f:\ lint\ free!,%f:\ line\ %l\\,\ col\ %c\\,\ %trror\ -\ %m,%f:\ line\ %l\\,\ col\ %c\\,\ %tarning\ -\ %m,%f:\ line\ %l\\,\ col\ %c\\,\ %m