Proper fullscreen flash in awesome

rc.lua

------------PUT THIS SOMEWHERE BEFORE YOUR awful.rules.rules TABLE-------------
-- Callback which restricts window properties to certain values
-- Use with caution, some programs could get stuck in an infinite loop
local function restrict(props)
    return function(c)
        for property, value in pairs(props) do
            c:connect_signal("property::" .. property, function(c, state)
                if state ~= value then
                    c[property] = value
                end
            end)
        end
    end
end

------------INSIDE awful.rules.rules----------
    { rule = { class = "Plugin-container" },
      callback = restrict({ fullscreen = true })},
    { rule = { class = "hl2_linux" },
      callback = restrict({ minimized = false, fullscreen = true })},