local beautiful = require("beautiful")

-- TODO this function will call arrange multiple times. once per each change of c.border_width
local function update_borders(s)
	local max = s.selected_tag.layout.name == "max"
	local only_one = #s.tiled_clients == 1 -- use tiled_clients so that other floating windows don't affect the count

	-- but iterate over clients instead of tiled_clients as tiled_clients doesn't include maximized windows
	for _, c in pairs(s.clients) do
		if c.prevent_kill then
			c.border_width = beautiful.border_width * 3
		elseif (max or only_one or c.maximized) and not c.floating then
			c.border_width = 0
		else
			c.border_width = beautiful.border_width
		end
	end
end

screen.connect_signal("arrange", update_borders) -- NOTE this signal may eventually be deprecated. see issue #2581 and the v5 milestone on github