fixed #1277

blocks.js

@@ -149,7 +149,7 @@ isSnapObject, copy, PushButtonMorph, SpriteIconMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2016-July-05';
+modules.blocks = '2016-July-06';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -3735,6 +3735,9 @@ CommandBlockMorph.prototype.allAttachTargets = function (newParent) {
         answer = [],
         topBlocks;
 
+    if (this instanceof HatBlockMorph && newParent.rejectsHats) {
+        return answer;
+    }
     topBlocks = target.children.filter(function (child) {
         return (child !== myself) &&
             child instanceof SyntaxElementMorph &&
@@ -5208,6 +5211,7 @@ ScriptsMorph.prototype.init = function (owner) {
     this.owner = owner || null;
     this.feedbackColor = SyntaxElementMorph.prototype.feedbackColor;
     this.feedbackMorph = new BoxMorph();
+    this.rejectsHats = false;
 
     // "undrop" attributes:
     this.lastDroppedBlock = null;
@@ -5739,6 +5743,9 @@ ScriptsMorph.prototype.fixMultiArgs = function () {
 
 ScriptsMorph.prototype.wantsDropOf = function (aMorph) {
     // override the inherited method
+    if (aMorph instanceof HatBlockMorph) {
+        return !this.rejectsHats;
+    }
     return aMorph instanceof SyntaxElementMorph ||
         aMorph instanceof CommentMorph;
 };

byob.js

@@ -108,7 +108,7 @@ WatcherMorph, Variable*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2016-July-04';
+modules.byob = '2016-July-06';
 
 // Declarations
 
@@ -1775,6 +1775,7 @@ BlockEditorMorph.prototype.init = function (definition, target) {
 
     // create scripting area
     scripts = new ScriptsMorph(target);
+    scripts.rejectsHats = true;
     scripts.isDraggable = false;
     scripts.color = IDE_Morph.prototype.groupColor;
     scripts.cachedTexture = IDE_Morph.prototype.scriptsPaneTexture;