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I use space for toggling folding: " space toggles the fold state under the cursor. nnoremap <silent><space> :exe 'normal! za'.(foldlevel('.')?'':'l')<cr>

• q_revert 14y ago
  same here, but use nnoremap <Space> za vnoremap <Space> za also, for folding in general I'd recommend using set foldmethod=marker which has the benefit of making folds more 'transparent' in your code, and also persistent across vim sessions