added “temporary?” as gettable and settable attribute for clones

blocks.js

@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2017-August-03';
+modules.blocks = '2017-August-29';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -8289,6 +8289,7 @@ InputSlotMorph.prototype.gettablesMenu = function () {
     if (StageMorph.prototype.enableInheritance) {
         dict.children = ['children'];
         dict.parent = ['parent'];
+        dict['temporary?'] = ['temporary?'];
     }
     dict.name = ['name'];
     dict.costumes = ['costumes'];

history.txt

@@ -3592,6 +3592,7 @@ Fixes:
 ------
 * Threads: allow two-item lists as x-y coordinate arguments for “distance to” reporter
 * GUI, Objects: enable exporting costumes and variable-data in the newest Chrome version, which disables opening tabs on dataURLs
+* Blocks, Threads: added “temporary?” as gettable and settable attribute for clones
 
 
 Features:

threads.js

@@ -3103,6 +3103,8 @@ Process.prototype.reportGet = function (query) {
             return thisObj.exemplar || '';
         case 'children':
             return new List(thisObj.specimens ? thisObj.specimens() : []);
+        case 'temporary?':
+            return thisObj.isTemporary || false;
         case 'clones':
             stage = thisObj.parentThatIsA(StageMorph);
             objName = thisObj.name || thisObj.cloneOriginName;
@@ -3190,6 +3192,16 @@ Process.prototype.doSet = function (attribute, value) {
         // needed: circularity avoidance
         rcvr.setExemplar(value);
         break;
+    case 'temporary?':
+        this.assertType(rcvr, 'sprite');
+        this.assertType(value, 'Boolean');
+        if (value) {
+            rcvr.release();
+        } else {
+            rcvr.perpetuate();
+        }
+        rcvr.version = Date.now();
+        break;
     case 'dangling?':
         this.assertType(rcvr, 'sprite');
         this.assertType(value, 'Boolean');