changed "switch to scene" to be a stop block

HISTORY.md

@@ -36,6 +36,7 @@
 ### 2021-09-08
 * objects: changed category for "switch to scene" to control
 * blocks, objects, threads: new hat block for "when this scene starts"
+* blocks, threads: changed "switch to scene" to be a stop block
 
 ### 2021-09-07
 * blocks, objects, threads: new change-of-scene event

src/blocks.js

@@ -5202,7 +5202,8 @@ CommandBlockMorph.prototype.isStop = function () {
     return ([
         'doForever',
         'doReport',
-        'removeClone'
+        'removeClone',
+        'doSwitchToScene'
     ].indexOf(this.selector) > -1);
 };
 

src/threads.js

@@ -4735,6 +4735,7 @@ Process.prototype.doSwitchToScene = function (id) {
             idx = this.reportBasicRandom(1, scenes.length());
             break;
         }
+        this.stop();
         ide.switchToScene(scenes.at(idx));
         return;
     }
@@ -4748,6 +4749,7 @@ Process.prototype.doSwitchToScene = function (id) {
         scene = scenes.at(num);
     }
 
+    this.stop();
     ide.switchToScene(scene);
 };