update awesomewm maximize button

user/config/awesome/rc.lua

@@ -553,6 +553,22 @@ client.connect_signal("manage", function (c)
     end
 end)
 
+local function custommaximizedbutton(c)
+  local widget = awful.titlebar.widget.button(c, "maximized", function(cl)
+    return cl.first_tag and awful.layout.get(cl.first_tag.screen) == awful.layout.suit.max
+  end, function(cl)
+    if cl.floating then
+      cl.floating = false
+    end
+    change_layout()
+  end)
+  local function update()
+    if not c.valid then tag.disconnect_signal("property::layout", update)
+    else widget.update() end
+  end
+  tag.connect_signal("property::layout", update)
+  return widget
+end
 -- Add a titlebar if titlebars_enabled is set to true in the rules.
 client.connect_signal("request::titlebars", function(c)
     -- buttons for the titlebar
@@ -585,7 +601,7 @@ client.connect_signal("request::titlebars", function(c)
         },
         { -- Right
             awful.titlebar.widget.minimizebutton (c),
-            awful.titlebar.widget.maximizedbutton(c),
+            custommaximizedbutton                (c),
             awful.titlebar.widget.closebutton    (c),
             layout = wibox.layout.fixed.horizontal()
         },