I am using vim with the fugitive extension. It has a :Gdiff command which brings you into vimdiff mode, but what is the right/quick way to close/quit vimdiff mode?
I.e.,
noremap <leader>do :diffoff \| windo if &diff \| hide \| endif<cr>
Quite diff mode and close other diff windows. (Note: fugitive will auto delete its hidden buffers.)
This works fine for me, combining some of the existing ideas here:
function! MyCloseDiff()
  if (&diff == 0 || getbufvar('#', '&diff') == 0)
        \ && (bufname('%') !~ '^fugitive:' && bufname('#') !~ '^fugitive:')
    echom "Not in diff view."
    return
  endif
  " close current buffer if alternate is not fugitive but current one is
  if bufname('#') !~ '^fugitive:' && bufname('%') =~ '^fugitive:'
    if bufwinnr("#") == -1
      b #
      bd #
    else
      bd
    endif
  else
    bd #
  endif
endfunction
nnoremap <Leader>gD :call MyCloseDiff()<cr>
Check the vimdiff toggling between diffthis and diffoff here
at this page.
The code:
nnoremap <silent> <Leader>df :call DiffToggle()<CR>
function! DiffToggle()
    if &diff
        diffoff
    else
        diffthis
    endif
:endfunction
:windo diffthis
:windo diffoff
I recommend just using the most simple command: :q<CR>
when you want to do it quickly, add the mapping:
" Set mapleader
let mapleader = ","
let g:mapleader = ","
and
" Quickly close the current window
nnoremap <leader>q :q<CR>
It works well for me. Exit vimdiff just by ,q, because normally your cursor in the old file.
You can execute windo set nodiff noscrollbind and then close the second window.
Update: there is a diffoff command. Use windo diffoff, not what I wrote in previous line.
this is what I have to leave the vimdiff windows after using :Gdiff
nnoremap gD :q!<CR> :Gedit!<CR>