made "temporary?" attribute for clones settable

in the SET->my... block

HISTORY.md

@@ -3,6 +3,7 @@
 ## in development:
 * **New Features:**
     * new "rgba" option in "(aspect) AT (location)" sensing reporter, returns a 4-item list of values from 0-255 (same is pixels from a costume)
+    * "temporary?" attribute is now programmatically settable (in the SET->my... block)
 * **Notable Changes:**
 * **Notable Fixes:**
 * **Translation Updates:**
@@ -10,6 +11,7 @@
 ### 2019-08-07
 * new dev version
 * blocks, threads: added "rgba" option to (aspect) AT (location) reporter in the sensing category
+* blocks, threads: made "temporary?" attribute for clones settable (in the SET->my... block)
 
 ## v5.0.9
 * **New Feature:**

src/blocks.js

@@ -622,7 +622,7 @@ SyntaxElementMorph.prototype.getVarNamesDict = function () {
                 'anchor' : ['anchor'],
                 'parent' : ['parent'],
                 'name' : ['name'],
-                // 'temporary?' : ['temporary?'],
+                'temporary?' : ['temporary?'],
                 'dangling?' : ['dangling?'],
                 'draggable?' : ['draggable?'],
                 'rotation style' : ['rotation style'],

src/threads.js

@@ -4431,12 +4431,10 @@ Process.prototype.doSet = function (attribute, value) {
     case 'temporary?':
         this.assertType(rcvr, 'sprite');
         this.assertType(value, 'Boolean');
-        if (rcvr.world().isDevMode) {
-            if (value) {
-                rcvr.release();
-            } else {
-                rcvr.perpetuate();
-            }
+        if (value) {
+            rcvr.release();
+        } else {
+            rcvr.perpetuate();
         }
         break;
     case 'name':