sort custom category menu ("delete a category") alphabetically

HISTORY.md

@@ -44,6 +44,7 @@
 * gui, byob, objects: scroll custom category buttons if there are more than 6
 * gui, byob: scroll selected custom category button into view
 * gui: fixed "show categories" setting display
+* gui: sort custom category menu ("delete a category") alphabetically
 
 ### 2021-10-12
 * scenes, store: store single palette setting per project (for making extensions)

src/gui.js

@@ -4996,7 +4996,11 @@ IDE_Morph.prototype.deleteUserCategory = function () {
         null,
         this
     );
-    SpriteMorph.prototype.customCategories.forEach((clr, name) =>
+
+    // sort alphabetically
+    Array.from(
+        SpriteMorph.prototype.customCategories.keys()
+    ).sort().forEach(name =>
         menu.addItem(
             name,
             name,