added "draggable" selector to attributes accessors

src/blocks.js

@@ -623,6 +623,8 @@ SyntaxElementMorph.prototype.getVarNamesDict = function () {
                 'parent' : ['parent'],
                 // 'temporary?' : ['temporary?'],
                 'dangling?' : ['dangling?'],
+                'draggable?' : ['draggable?'], // +++
+                'rotation style' : ['rotation style'], // +++
                 'rotation x' : ['rotation x'],
                 'rotation y' : ['rotation y']
             };
@@ -8755,6 +8757,8 @@ InputSlotMorph.prototype.gettablesMenu = function () {
     dict.costumes = ['costumes'];
     dict.sounds = ['sounds'];
     dict['dangling?'] = ['dangling?'];
+    dict['draggable?'] = ['draggable?']; // +++
+    dict['rotation style'] = ['rotation style']; // +++
     dict['rotation x'] = ['rotation x'];
     dict['rotation y'] = ['rotation y'];
     dict['center x'] = ['center x'];

src/threads.js

@@ -3584,6 +3584,8 @@ Process.prototype.reportGet = function (query) {
             );
         case 'dangling?':
             return !thisObj.rotatesWithAnchor;
+        case 'draggable?':
+            return thisObj.isDraggable; // +++
         case 'rotation x':
             return thisObj.xPosition();
         case 'rotation y':
@@ -3627,7 +3629,7 @@ Process.prototype.reportObject = function (name) {
 
 Process.prototype.doSet = function (attribute, value) {
     // experimental, manipulate sprites' attributes
-    var name, rcvr;
+    var name, rcvr, ide;
     rcvr = this.blockReceiver();
     this.assertAlive(rcvr);
     if (!(attribute instanceof Context || attribute instanceof Array) ||
@@ -3680,6 +3682,21 @@ Process.prototype.doSet = function (attribute, value) {
         rcvr.rotatesWithAnchor = !value;
         rcvr.version = Date.now();
         break;
+    case 'draggable?':
+        this.assertType(rcvr, 'sprite');
+        this.assertType(value, 'Boolean');
+        rcvr.isDraggable = value;
+        // update padlock symbol in the IDE:
+        ide = rcvr.parentThatIsA(IDE_Morph);
+        if (ide) {
+            ide.spriteBar.children.forEach(function (each) {
+                if (each.refresh) {
+                    each.refresh();
+                }
+            });
+        }
+        rcvr.version = Date.now();
+        break;
     case 'rotation x':
         this.assertType(rcvr, 'sprite');
         this.assertType(value, 'number');