backwards-compatibility fix for key-event hat blocks

HISTORY.md

@@ -9,6 +9,7 @@
     * hide any block, including variables and custom helper blocks in palette, also use "hide/show var" primitive on custom blocks (same as on primitives)
     * generate Parsons Problems from projects: Hide all unused blocks from the scripting area in the palette
     * user defined custom block palettes
+    * introspection, syntax analysis and assembly (new block-attribute reporter, split & join scripts)
     * PWA, thanks, Joan and John, for pioneering this at Robolot and in Mircoblocks!
     * new "blocksZoom=n" url parameter, thanks, Bernat!
     * message and key hat blocks can be expanded to show an optional upvar referencing their event data
@@ -68,6 +69,9 @@
     * Chinese, thanks, Simon!
     * Brazilian Portuguese, thank you, Cassiano D'Andrea!
 
+### 2021-12-07
+* objects: backwards-compatibility fix for key-event hat blocks
+
 ### 2021-12-06
 * blocks, threads: refactored block assembly, experimental
 * German translation update

snap.html

@@ -18,7 +18,7 @@
         <script src="src/widgets.js?version=2021-17-09"></script>
         <script src="src/blocks.js?version=2021-12-06"></script>
         <script src="src/threads.js?version=2021-12-06"></script>
-        <script src="src/objects.js?version=2021-12-05"></script>
+        <script src="src/objects.js?version=2021-12-07"></script>
         <script src="src/scenes.js?version=2021-11-24"></script>
         <script src="src/gui.js?version=2021-12-06"></script>
         <script src="src/paint.js?version=2021-07-05"></script>

src/objects.js

@@ -87,7 +87,7 @@ BlockVisibilityDialogMorph*/
 
 /*jshint esversion: 6*/
 
-modules.objects = '2021-November-05';
+modules.objects = '2021-November-07';
 
 var SpriteMorph;
 var StageMorph;
@@ -6299,7 +6299,8 @@ SpriteMorph.prototype.allHatBlocksForKey = function (key) {
     return this.scripts.children.filter(morph => {
         if (morph.selector) {
             if (morph.selector === 'receiveKey') {
-                var evt = morph.inputs()[0].evaluate()[0];
+                var choice = morph.inputs()[0].evaluate(),
+                    evt = choice instanceof Array ? choice[0] : choice;
                 return evt === key || evt === 'any key';
             }
         }