record unsaved changes when making / deleting / duplicate custom block definitions

snap.html

@@ -14,7 +14,7 @@
         <script src="src/gui.js?version=2020-12-22"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
         <script src="src/lists.js?version=2020-12-01"></script>
-        <script src="src/byob.js?version=2020-11-27"></script>
+        <script src="src/byob.js?version=2020-12-22"></script>
         <script src="src/tables.js?version=2020-10-06"></script>
         <script src="src/sketch.js?version=2020-07-13"></script>
         <script src="src/video.js?version=2019-06-27"></script>

src/byob.js

@@ -107,7 +107,7 @@ WatcherMorph, Variable, BooleanSlotMorph, XML_Serializer, SnapTranslator*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2020-November-27';
+modules.byob = '2020-December-22';
 
 // Declarations
 
@@ -1278,6 +1278,7 @@ CustomCommandBlockMorph.prototype.duplicateBlockDefinition = function () {
 
     ide.flushPaletteCache();
     ide.refreshPalette();
+    ide.recordUnsavedChanges();
     new BlockEditorMorph(dup, rcvr).popUp();
 };
 
@@ -1318,6 +1319,7 @@ CustomCommandBlockMorph.prototype.deleteBlockDefinition = function () {
             if (ide) {
                 ide.flushPaletteCache();
                 ide.refreshPalette();
+                ide.recordUnsavedChanges();
             }
         },
         this

src/objects.js

@@ -2819,6 +2819,7 @@ SpriteMorph.prototype.makeBlock = function () {
                 }
                 ide.flushPaletteCache();
                 ide.refreshPalette();
+                ide.recordUnsavedChanges();
                 new BlockEditorMorph(definition, this).popUp();
             }
         },