fixed copying unattached comments among sprites, thanks, @jadga-h for the report!

HISTORY.md

@@ -25,6 +25,7 @@
     * fixed audio_comp library "plot sound" block to work with translations, thanks, Hans, for the report!
     * colors library: fixed SET PEN to work with more than a single sprite per costume,  thanks, Jadga, for the report!
     * fixed exporting comment pics from inside the block editor, thanks, Jadga, for the report!
+    * fixed copying unattached comments among sprites, thanks, Jadga, for the report!
 * **Documentation Updates:**
     * updated manual, thanks Brian!
     * updated readme, thanks, Michael!
@@ -34,6 +35,7 @@
 
 ### 2021-09-06
 * blocks: fixed exporting comment pics from inside the block editor, thanks, Jadga, for the report!
+* gui: fixed copying unattached comments among sprites, thanks, Jadga, for the report!
 
 ### 2021-08-27
 * colors library: fixed SET PEN to work with more than a single sprite per costume, thanks, Jadga, for the report!

snap.html

@@ -20,7 +20,7 @@
         <script src="src/threads.js?version=2021-07-20"></script>
         <script src="src/objects.js?version=2021-07-23"></script>
         <script src="src/scenes.js?version=2021-07-21"></script>
-        <script src="src/gui.js?version=2021-08-06"></script>
+        <script src="src/gui.js?version=2021-09-06"></script>
         <script src="src/paint.js?version=2021-07-05"></script>
         <script src="src/lists.js?version=2021-07-19"></script>
         <script src="src/byob.js?version=2021-08-03"></script>

src/gui.js

@@ -9419,12 +9419,13 @@ SpriteIconMorph.prototype.wantsDropOf = function (morph) {
     // allow scripts & media to be copied from one sprite to another
     // by drag & drop
     return morph instanceof BlockMorph
+        || (morph instanceof CommentMorph)
         || (morph instanceof CostumeIconMorph)
         || (morph instanceof SoundIconMorph);
 };
 
 SpriteIconMorph.prototype.reactToDropOf = function (morph, hand) {
-    if (morph instanceof BlockMorph) {
+    if (morph instanceof BlockMorph || morph instanceof CommentMorph) {
         this.copyStack(morph);
     } else if (morph instanceof CostumeIconMorph) {
         this.copyCostume(morph.object);
@@ -9446,7 +9447,9 @@ SpriteIconMorph.prototype.copyStack = function (block) {
 
     dup.setPosition(new Point(sprite.scripts.left() + 20, y + 20));
     sprite.scripts.add(dup);
-    dup.allComments().forEach(comment => comment.align(dup));
+    if (dup instanceof BlockMorph) {
+        dup.allComments().forEach(comment => comment.align(dup));
+    }
     sprite.scripts.adjustBounds();
 
     // delete all local custom blocks (methods) that the receiver