How can I open a vim fold so that it is not affected by `foldclose=all`?

Question

In my config file I have set foldclose=all so that folds get automatically closed upon cursor leaving them. However, sometimes, I want a specific fold not to close for a while.

Because folds below foldlevel=# and folds smaller than foldminlines=# are not affected by foldclose=all, there must exist a list of folds that foldclose=all doesn't work on.

I want to create a mapping that puts a particular fold (the one where my cursor is) to that list so that it's temporarily not affected by foldclose=all, i.e., so that it doesn't close automatically even though foldclose is set to all.

How can I add folds to those that foldclose=all doesn't work on?

I did not find anything in the neovim documentation on folds and tried to make a workaround by using :mkview but then I would have to have :loadview triggered every time a fold is closed, which I don't know how to do (and doesn't seem to be feasible and efficient). I work in c++ and my default settings are foldlevel=1, foldmethod=syntax, foldopen=hor.

Answer 1

Vim defaults to foldlevel=0. Consider setting it in vimrc to 2 and setting the fold you want left open to 1.

I use fold markers, and the way to set fold levels is to add a number to the marker:

" I'm fold 1 {{{1
" End fold 1 }}}

" I'm fold 2 {{{2
" End fold 2 }}}

If you're using some other fold method, I'm not sure how to set the level of a particular fold. I can't seem to locate that information in the docs.

An alternative, if you truly do want it open permanently as the title of your question says, is to delete the fold.