vim/plugin/undoskip.vim


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" Don't save undo history for temporary or secure files
augroup undoskip
  autocmd!
  autocmd BufAdd,BufNewFile,BufRead
        \ *
        \ setlocal undofile<
  autocmd BufAdd,BufNewFile,BufRead
        \ /dev/shm/*,/tmp/*,/var/tmp/*
        \ setlocal noundofile
augroup END