fixed vanishing JSF block bug in new error messages

HISTORY.md

@@ -26,6 +26,7 @@
 * morphic: made scrollbars thinner by default
 * morphic: tweaked slider transparency for flat design mode
 * objects: translation support for category labels in the unified palette
+* threads: fixed vanishing JSF block bug in new error messages
 
 ### 2021-07-08
 * objects: added category labels to unified palette

snap.html

@@ -9,7 +9,7 @@
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-07-05"></script>
         <script src="src/blocks.js?version=2021-07-05"></script>
-        <script src="src/threads.js?version=2021-07-07"></script>
+        <script src="src/threads.js?version=2021-07-09"></script>
         <script src="src/objects.js?version=2021-07-09"></script>
         <script src="src/scenes.js?version=2021-07-06"></script>
         <script src="src/gui.js?version=2021-07-08"></script>

src/threads.js

@@ -64,7 +64,7 @@ SnapExtensions, AlignmentMorph, TextMorph*/
 
 /*jshint esversion: 6*/
 
-modules.threads = '2021-July-07';
+modules.threads = '2021-July-09';
 
 var ThreadManager;
 var Process;
@@ -1191,7 +1191,7 @@ Process.prototype.errorBubble = function (error, element) {
             blockToShow = blockToShow.parent;
         }
         errorMorph.text += `\n${localize('The error occured at:')}\n`;
-        errorMorph.add(blockToShow);
+        errorMorph.add(blockToShow.fullCopy());
         errorMorph.fixLayout();
     }