Signifcant performance overhead on watching .git folder

[dmtrKovalenko]

I have been debugging why in some of the folders my plugin fff scan is very contended and sometimes very slow on a large git repo and as appeared the reason is this function

git-conflict.nvim/lua/git-conflict.lua

Lines 458 to 470 in a1badcd

	local function watch_gitdir(dir)
	-- Stop if there is already a watcher running
	if watchers[dir] then return end
	---@type userdata
	watchers[dir] = vim.loop.new_fs_event()
	watchers[dir]:start(
	dir,
	{ recursive = true },
	vim.schedule_wrap(function(...) on_throttled_change(dir, ...) end)
	)
	state.current_watcher_dir = dir
	end

you are setting recursive watcher on the .git folder unconditionally in case of chromium monorepo the .git folder is 64GB and 700k+ object files inside - this exhauses the file system watcher, adds a lot of VFS load and simply unnecessary

Instead you can watch specifically one file .git/index - you can watch exatly one path and keep the exact functionality untouched

[v3ceban]

@dmtrKovalenko can you please check if this fixes it?