Bug: CPU usage 100% when using luadoc TS parser in split-pane

[litoj]

Self Checks

• I'm using the latest lualine.
• I didn't find the issue in existing issues or PRs.

How to reproduce the problem

1. open a lua file with type annotations where the annotations don't all fit on the screen - example file provided in Additional Info
2. :vsplit
3. press G in the second pane to go to the bottom of the file
4. observe the performance suddenly goes up (to 12% in my case when using this almost empty file)

Expected behaviour

The cpu usage should stay at practically 0 since nothing is happening. Just like with the default statusline

Actual behaviour

nvim has signifficantly increased cpu usage for as long as the second buffer is open and scrolled over a different luadoc text

Minimal config to reproduce the issue

Using Lazy.nvim This is the entire config necessary to reproduce the problem:

-- to make it clear it happens even with no modules enabled -> some internal bug
vim.o.laststatus = 3
return {
	{
		'nvim-lualine/lualine.nvim',
		dependencies = { 'nvim-tree/nvim-web-devicons' },
		event = 'VeryLazy',
		opts = {
			sections = {
				lualine_a = {},
				lualine_b = {},
				lualine_c = {},
				lualine_x = {},
				lualine_y = {},
				lualine_z = {},
			},
		},
	},
	{
		'nvim-treesitter/nvim-treesitter',
		build = ':TSUpdate',
		event = 'VeryLazy',
		config = function()
			---@diagnostic disable-next-line: missing-fields
			require('nvim-treesitter.configs').setup { ensure_installed = { 'lua', 'luadoc' } }
		end,
	},
}

Additional information

lua file with replicatable issue (renamed to .txt for github)
bug.txt

you can track the performance change with the following bash script:

#!/usr/bin/bash
proc="${PROC:-nvim --embed}"
interval=${INTERVAL_MS:-1000} # interval in ms
seconds=$(bc <<<"scale=2;$interval/1000") # recalculated to s
while :; do
	pids=($(pgrep -f "$proc")) # get all nvim processes

	declare -i sum=0 # sum up the current cpu usage
	for pid in ${pids[@]}; do
		((sum -= $(cat /proc/$pid/stat | awk '{print $14+$15}')))
	done

	sleep $seconds

	for pid in ${pids[@]}; do # calculate the diff in cpu usage
		((sum += $(cat /proc/$pid/stat | awk '{print $14+$15}')))
	done

	((sum = 1000 * sum / interval)) # make the usage relative to 1 second
	echo "${proc^^}: $sum%"
done

[litoj]

Correction: the problem is also present in feline as the statusline provider, but the impact was only 5% in densely annotated files whereas lualine put it to 100%.

I am unable to reproduce it with the default nvim statusline