prevent unclosable Morphic menus, thanks @brollb !

HISTORY.md

@@ -20,7 +20,8 @@
     * German
 
 ### 2020-10-27
-* gui, objects, store: pause generic WHEN hat blocks when loading a project or importing a sprite until the user clicks the green flag or un-pauses the red stop sign, unless opening it with #run:&noRun 
+* gui, objects, store: pause generic WHEN hat blocks when loading a project or importing a sprite until the user clicks the green flag or un-pauses the red stop sign, unless opening it with #run:&noRun
+* morphic: prevent unclosable menus, thanks, Brian B.! 
 
 ### 2020-10-26
 * objects: added test for the existence of generic WHEN hat blocks

snap.html

@@ -5,7 +5,7 @@
         <meta name="viewport" content="width=device-width, initial-scale=1">
         <title>Snap! 6.3.0 - dev - Build Your Own Blocks</title>
         <link rel="icon" href="src/favicon.ico">
-        <script src="src/morphic.js?version=2020-10-22"></script>
+        <script src="src/morphic.js?version=2020-10-27"></script>
         <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=2020-10-23"></script>

src/morphic.js

@@ -1271,7 +1271,7 @@
     Michael Ball found and fixed a longstanding scrolling bug.
     Brian Harvey contributed to the design and implementation of submenus.
     Ken Kahn contributed to Chinese keboard entry and Android support.
-    Brian Broll contributed clickable URLs in text elements.
+    Brian Broll contributed clickable URLs in text elements and many bugfixes.
 
     - Jens Mönig
 */
@@ -1280,7 +1280,7 @@
 
 /*global window, HTMLCanvasElement, FileReader, Audio, FileList, Map*/
 
-var morphicVersion = '2020-October-22';
+var morphicVersion = '2020-October-27';
 var modules = {}; // keep track of additional loaded modules
 var useBlurredShadows = true;
 
@@ -8400,7 +8400,8 @@ MenuMorph.prototype.destroy = function () {
     if (this.hasFocus) {
         this.world.keyboardFocus = null;
     }
-    if (!this.isListContents) {
+    const isActiveMenu = this.world.activeMenu === this;
+    if (!this.isListContents && isActiveMenu) {
         this.world.activeMenu = null;
     }
     MenuMorph.uber.destroy.call(this);