don't report invisible neighbors

HISTORY.md

@@ -4,6 +4,10 @@
 
 * **Notable Fixes:**
     * fixed stretching SVG costumes with fixed aspect ratios in Firefox
+    * only report neighbors that are visible
+
+### 2020-11-20
+* threads: only report neighbors that are visible, thanks Frederic, for reporting this bug!
 
 ### 2020-11-19
 * new dev version

snap.html

@@ -9,7 +9,7 @@
         <script src="src/symbols.js?version=2020-10-07"></script>
         <script src="src/widgets.js?version=2020-10-06"></script>
         <script src="src/blocks.js?version=2020-11-17"></script>
-        <script src="src/threads.js?version=2020-11-15"></script>
+        <script src="src/threads.js?version=2020-11-20"></script>
         <script src="src/objects.js?version=2020-11-19"></script>
         <script src="src/gui.js?version=2020-11-19"></script>
         <script src="src/paint.js?version=2020-05-17"></script>

src/threads.js

@@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy, Map,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, BLACK,
 TableFrameMorph, ColorSlotMorph, isSnapObject, newCanvas, Symbol, SVG_Costume*/
 
-modules.threads = '2020-November-15';
+modules.threads = '2020-November-20';
 
 var ThreadManager;
 var Process;
@@ -4904,8 +4904,9 @@ Process.prototype.reportGet = function (query) {
             return new List(
                 stage.children.filter(each =>
                     each instanceof SpriteMorph &&
+                        each.isVisible &&
                         (each !== thisObj) &&
-                            each.bounds.intersects(neighborhood)
+                        each.bounds.intersects(neighborhood)
                 )
             );
         case 'dangling?':