Blocks: fixed CommentMorph hiding/showing bug

when switching to / from presentation mode the previously hidden text
(in collapsed state) was again shown along with the resize handle

blocks.js

@@ -155,7 +155,7 @@ DialogBoxMorph, BlockInputFragmentMorph, PrototypeHatBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2013-July-04';
+modules.blocks = '2013-July-05';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -9933,6 +9933,24 @@ CommentMorph.prototype.userMenu = function () {
     return menu;
 };
 
+// CommentMorph hiding and showing:
+
+/*
+    override the inherited behavior to recursively hide/show all
+    children, so that my instances get restored correctly when
+    switching back out of app mode.
+*/
+
+CommentMorph.prototype.hide = function () {
+    this.isVisible = false;
+    this.changed();
+};
+
+CommentMorph.prototype.show = function () {
+    this.isVisible = true;
+    this.changed();
+};
+
 // CommentMorph dragging & dropping
 
 CommentMorph.prototype.prepareToBeGrabbed = function () {

history.txt

@@ -1782,3 +1782,7 @@ ______
 130704
 ------
 * Codification (text code mapping and block header support)
+
+130705
+------
+* Blocks: fixed CommentMorph hiding/showing bug when switching to / from presentation mode