When pressing tab in any language in edit mode, nothing happens if the character before the cursor is not a space or a tab. Doing ctrl-v tab works, but I don't want to have to do that every time and presumably it would cause some problems if I rebind tab to that.

When doing nvim --clean, I have no problems, but before I uninstall every plugin and start from the top, does anyone know which plugin or piece of config may be causing this?




  • vi.stackexchange.com/q/2003/10604 and :verbose set expandtab?, perhaps
    – D. Ben Knoble
    Jul 31, 2021 at 22:10
  • 1
    Does :imap <Tab> show a mapping for Tab in Insert mode?
    – filbranden
    Aug 1, 2021 at 0:06
  • 1
    Looks like it's the mapping from line 262 of your init.vim, which is triggering coc#refresh() on tab, unless on a pop-up menu or when preceded by whitespace...
    – filbranden
    Aug 1, 2021 at 0:10

1 Answer 1


From https://github.com/neoclide/coc.nvim/wiki/Completion-with-sources#improve & https://bleepcoder.com/coc-nvim/421789422/issue-on-pressing-tab-at-the-end-of-a-word, a better version without this problem:

inoremap <expr> <Tab> pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"

function! s:check_back_space() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~# '\s'
  • You should probably show the check_back_space definition to make the answer complete
    – D. Ben Knoble
    Aug 11, 2021 at 11:09
  • Also, the posted code sets two mappings for tab—the second will completely override the first?
    – D. Ben Knoble
    Aug 11, 2021 at 11:10

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