Ignore empty lines on fold, like treesitter

[yochem]

Neovim version (nvim -v | head -n1)

NVIM v0.10.0-dev-743+g9b5f58185-Homebrew

Operating system/version

MacOS 14.0

How to reproduce the issue

1. Use the following config for nvim-ufo (via lazy.nvim):

return {
	'kevinhwang91/nvim-ufo',
	init = function ()
		vim.keymap.set('n', 'zR', function ()
			require('ufo').openAllFolds()
		end)
		vim.keymap.set('n', 'zR', function ()
			require('ufo').closeAllFolds()
		end)
	end,
	opts = {
		provider_selector = function(bufnr, filetype, buftype)
			return {'treesitter', 'indent'}
		end
	},
	dependencies = {
		'kevinhwang91/promise-async'
	},
	event = "BufReadPost",
}

2. Open markdown file and add something like this:

# test

test


# new header

3. Move cursor to line under # test and fold (e.g. with zc)
4. Notice it includes the empty lines. nvim-treesitter does not do this. It trims these emtpy lines from the region here.

Expected behavior

# test...


# new header

Expect it to use treesitter to get its folds, and thus exclude empty lines from fold. This behaviour can be seen by disabling nvim-ufo (in the lazy.nvim config above, add enabled = false). Restart nvim and run: set foldmethod=expr foldexpr=nvim_treesitter#foldexpr(). This should exclude the empty lines in the fold.

Actual behavior

# test...
# new header

It includes the empty lines in the fold.

[yochem]

You're awesome! Thank you so much 🙏🏼