Fix stack glows so that stacks glow as soon as the first block in the stack starts running as opposed to after the first block has finished. Make sure that monitored reporters in the flyout are not glowing.

src/engine/blocks.js

@@ -14,8 +14,13 @@ const Variable = require('./variable');
  * and handle updates from Scratch Blocks events.
  */
 
+/**
+ * Create a block container.
+ * @param {boolean} optNoGlow Optional flag to indicate that blocks in this container
+ * should not request glows. This does not affect glows when clicking on a block to execute it.
+ */
 class Blocks {
-    constructor () {
+    constructor (optNoGlow) {
         /**
          * All blocks in the workspace.
          * Keys are block IDs, values are metadata about the block.
@@ -61,6 +66,17 @@ class Blocks {
             _executeCached: {}
         };
 
+        /**
+         * Flag which indicates that blocks in this container should not glow.
+         * Blocks will still glow when clicked on, but this flag is used to control
+         * whether the blocks in this container can request a glow as part of
+         * a running stack. E.g. the flyout block container and the monitor block container
+         * should not be able to request a glow, but blocks containers belonging to
+         * sprites should.
+         * @type {boolean}
+         */
+        this.forceNoGlow = optNoGlow || false;
+
     }
 
     /**
@@ -241,7 +257,7 @@ class Blocks {
     }
 
     duplicate () {
-        const newBlocks = new Blocks();
+        const newBlocks = new Blocks(this.forceNoGlow);
         newBlocks._blocks = Clone.simple(this._blocks);
         newBlocks._scripts = Clone.simple(this._scripts);
         return newBlocks;