In the README file it says: "If you prefer that folds are updated whenever you close or open folds by a standard keystroke such as zx,zo or zc, then add let g:fastfold_fold_command_suffixes = [] to your .vimrc." Looking at the source, it seems that that should be "prefer that folds are not updated".
In the README file it says: "If you prefer that folds are updated whenever you close or open folds by a standard keystroke such as zx,zo or zc, then add let g:fastfold_fold_command_suffixes = [] to your .vimrc." Looking at the source, it seems that that should be "prefer that folds are not updated".