toggle_auto_expand_width in neo-tree + edgy

[axkirillov]

Currently neo-tree's toggle_auto_expand_width (the e shortcut) is not supported out-of-the box in edgy and is causing erratic buggy rendering.
I was able to make it work though, with the following code snippet.

local function find_longest_line()
	local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
	local max_length = 0

	for _, line in ipairs(lines) do
		max_length = math.max(max_length, vim.fn.strdisplaywidth(line))
	end

	return max_length
end

local function toggle_auto_expand_width(win)
	local win_width = vim.api.nvim_win_get_width(0)
	local state = require("neo-tree.sources.manager").get_state("filesystem")
	if state.window.auto_expand_width then
		win.view.edgebar:equalize()
	end
	require("neo-tree.sources.common.commands").toggle_auto_expand_width(state)
	local longest_line = find_longest_line()
	while win_width < longest_line + 1 do
		win:resize("width", 1)
		win_width = win_width + 1
	end
end

return {
	"folke/edgy.nvim",
	event = "VeryLazy",
	init = function()
		vim.opt.laststatus = 3
		vim.opt.splitkeep = "screen"
	end,
	opts = {
		keys = {
			["e"] = toggle_auto_expand_width,
		},
		left = {
			-- Neo-tree filesystem always takes half the screen height
			{
				title = "Neo-Tree",
				ft = "neo-tree",
				filter = function(buf)
					return vim.b[buf].neo_tree_source == "filesystem"
				end,
				size = { height = 0.5 },
			},
		},
	},
}