retain the current process receiver when launching a new thread

history.txt

@@ -3700,6 +3700,7 @@ Fixes:
 171012
 ------
 * Threads: make sure to retain the current instrument when launching a new thread
+* Threads: retain the current receiver when launching a new thread
 
 
 v4.1 Features:

threads.js

@@ -1165,6 +1165,7 @@ Process.prototype.fork = function (context, args) {
     var proc = new Process(),
         stage = this.homeContext.receiver.parentThatIsA(StageMorph);
     proc.instrument = this.instrument;
+    proc.receiver = this.receiver;
     proc.initializeFor(context, args);
     // proc.pushContext('doYield');
     stage.threads.processes.push(proc);