wibox: do not set need_arrange on wibox detach

Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful/layout/init.lua.in

@@ -93,8 +93,9 @@ function getname(layout)
 end
 
 hooks.arrange.register(on_arrange)
-hooks.property.register(function (c, prop)
+hooks.property.register(function (obj, prop)
-    if type(c) ~= "client" then return end
+    local objtype = type(obj)
+    if objtype == "client" then
         if prop == "size_hints_honor"
             or prop == "struts"
             or prop == "minimized"
@@ -104,7 +105,7 @@ hooks.property.register(function (c, prop)
             or prop == "maximized_vertical"
             or prop == "border_width"
             or prop == "hide" then
-        on_arrange(c.screen)
+            on_arrange(obj.screen)
         elseif prop == "screen" then
             -- If prop is screen, we do not know what was the previous screen, so
             -- let's arrange all screens :-(
@@ -112,6 +113,11 @@ hooks.property.register(function (c, prop)
                 on_arrange(screen)
             end
         end
+    elseif objtype == "wibox" then
+        if prop == "screen" then
+            on_arrange(obj.screen)
+        end
+    end
 end)
 hooks.wibox_position.register(function(wibox)
     on_arrange(wibox.screen)

wibox.c

@@ -386,8 +386,6 @@ wibox_detach(wibox_t *wibox)
 
         simplewindow_wipe(&wibox->sw);
 
-        wibox->screen->need_arrange = true;
-
         foreach(item, globalconf.wiboxes)
             if(*item == wibox)
             {