examples/editor.rb in graphics-1.1.1 vs examples/editor.rb in graphics-1.1.2

@@ -10,10 +10,10 @@
 
   def initialize
     super 850, 850
 
     self.overlay = true
-    self.s = ""
+    self.s = +""
     self.lines = []
   end
 
   def initialize_keys
     # no super