Stop Vim from deleting trailing whitespace [closed]

Question

Vim automatically strips trailing whitespace from my files on save, which is extremely annoying in various contexts. How do I disable this behaviour?

This question is not a duplicate of this one, because I'm not using editorconfig at all. This behaviour has been the default in every version of Vim I've ever used, including MacVim, NeoVim, and the build of Vim 8.1 I compiled myself.

Answer 1

In my .vimrc I have the following function:

" Trim trailing whitespace
" ========================
function! TrimWhitespace()
  " trailing whitespaces have meaning in markdown so don't try there
  if &filetype!='markdown'
    let l:save = winsaveview()
    %s/\s\+$//e
    call winrestview(l:save)
  endif
endfunction

command! TrimWhitespace call TrimWhitespace()

This checks if the current file is a markdown file, and disables the removal of trailing whitespace if it is. You can expand this for other filetypes.

Answer 2

@statox was right on the money: it was, of course, an old leftover in my .vimrc. Who would have guessed!