layout: arrange on minimize

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

lib/awful/layout/init.lua.in

@@ -96,7 +96,8 @@ hooks.arrange.register(on_arrange)
 hooks.property.register(function (c, prop)
     if type(c) == "client" and c:isvisible()
         and (prop == "size_hints_honor"
-             or prop == "struts") then
+             or prop == "struts"
+             or prop == "minimized") then
         on_arrange(c.screen)
     end
 end)