From 51e700dfa718271ba06af1562dd361a485f942eb Mon Sep 17 00:00:00 2001
From: Walter Bender <walter.bender@gmail.com>
Date: Thu, 03 Nov 2011 17:09:56 +0000
Subject: more compact/robust solution

---
diff --git a/TurtleArt/sprites.py b/TurtleArt/sprites.py
index f4ca4b4..1e398a0 100644
--- a/TurtleArt/sprites.py
+++ b/TurtleArt/sprites.py
@@ -233,10 +233,11 @@ class Sprite:
         self.set_image(image, i)
         self.inval()
 
-    def set_layer(self, layer):
+    def set_layer(self, layer=None):
         ''' Set the layer for a sprite '''
         self._sprites.remove_from_list(self)
-        self.layer = layer
+        if layer is not None:
+            self.layer = layer
         for i in range(self._sprites.length_of_list()):
             if layer < self._sprites.get_sprite(i).layer:
                 self._sprites.insert_in_list(self, i)
@@ -307,7 +308,7 @@ class Sprite:
 
     def restore(self):
         ''' Restore a hidden sprite '''
-        self.inval()
+        self.set_layer()
 
     def inval(self):
         ''' Invalidate a region for gtk '''
diff --git a/TurtleArt/tautils.py b/TurtleArt/tautils.py
index 9372576..93886be 100644
--- a/TurtleArt/tautils.py
+++ b/TurtleArt/tautils.py
@@ -492,7 +492,6 @@ def restore_stack(top):
         else:
             if not _hit_bottom:
                 _blk.spr.restore()
-                _blk.spr.set_layer(BLOCK_LAYER)
                 _blk.status = None
             else:
                 _blk.spr.move_relative((_dx, _dy))
@@ -575,7 +574,6 @@ def collapse_stack(top):
             _dy += _newdy - _olddy
         else:
             if not _hit_bottom:
-                _blk.spr.set_layer(HIDE_LAYER)
                 _blk.spr.hide()
                 _blk.status = 'collapsed'
             else:
--
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