fixed #3085 (I hope ^^)

HISTORY.md

@@ -62,6 +62,9 @@
     * German
     * Greek, thank you, HM100!
 
+### 2022-07-31
+* threads: fixed #3085 (I hope ^^)
+
 ### 2022-07-30
 * Greek translation update, thank you, HM100!!
 * blocks: include custom block definition in the "scripts pic" of the block editor

snap.html

@@ -17,7 +17,7 @@
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-17-09"></script>
         <script src="src/blocks.js?version=2022-07-30"></script>
-        <script src="src/threads.js?version=2022-07-19"></script>
+        <script src="src/threads.js?version=2022-07-31"></script>
         <script src="src/objects.js?version=2022-07-19"></script>
         <script src="src/scenes.js?version=2022-03-03"></script>
         <script src="src/gui.js?version=2022-07-22"></script>

src/threads.js

@@ -65,7 +65,7 @@ StagePickerMorph, CustomBlockDefinition*/
 
 /*jshint esversion: 11, bitwise: false, evil: true*/
 
-modules.threads = '2022-July-19';
+modules.threads = '2022-July-31';
 
 var ThreadManager;
 var Process;
@@ -1646,7 +1646,8 @@ Process.prototype.evaluateCustomBlock = function () {
         exit,
         i,
         value,
-        outer;
+        outer,
+        self;
 
     if (!context) {return null; }
     this.procedureCount += 1;
@@ -1677,6 +1678,9 @@ Process.prototype.evaluateCustomBlock = function () {
     runnable.isCustomBlock = true;
     this.context.parentContext = runnable;
 
+    // capture the runtime environment in "this script"
+    self = copy(runnable);
+
     // passing parameters if any were passed
     if (parms.length > 0) {
 
@@ -1733,7 +1737,7 @@ Process.prototype.evaluateCustomBlock = function () {
             this.readyToYield = true;
         }
     }
-    outer.variables.addVar(Symbol.for('self'), method.body || new Context());
+    outer.variables.addVar(Symbol.for('self'), self);
     runnable.expression = runnable.expression.blockSequence();
 };