used new symbols for block-context-menu options

snap.html

@@ -7,10 +7,10 @@
         <script type="text/javascript" src="src/morphic.js?version=2020-05-19"></script>
         <script type="text/javascript" src="src/symbols.js?version=2020-05-28"></script>
         <script type="text/javascript" src="src/widgets.js?version=2020-05-06"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2020-05-25"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2020-05-28"></script>
         <script type="text/javascript" src="src/threads.js?version=2020-05-27"></script>
         <script type="text/javascript" src="src/objects.js?version=2020-05-18"></script>
-        <script type="text/javascript" src="src/gui.js?version=2020-05-27"></script>
+        <script type="text/javascript" src="src/gui.js?version=2020-05-28"></script>
         <script type="text/javascript" src="src/paint.js?version=2020-05-17"></script>
         <script type="text/javascript" src="src/lists.js?version=2020-05-18"></script>
         <script type="text/javascript" src="src/byob.js?version=2020-05-27"></script>

src/blocks.js

@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2020-May-25';
+modules.blocks = '2020-May-28';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2625,10 +2625,17 @@ BlockMorph.prototype.userMenu = function () {
         top;
 
     function addOption(label, toggle, test, onHint, offHint) {
-        var on = '\u2611 ',
-            off = '\u2610 ';
         menu.addItem(
-            (test ? on : off) + localize(label),
+            [
+                test ? new SymbolMorph(
+                    'checkedBox',
+                    MorphicPreferences.menuFontSize * 0.75
+                ) : new SymbolMorph(
+                    'rectangle',
+                    MorphicPreferences.menuFontSize * 0.75
+                ),
+                localize(label)
+            ],
             toggle,
             test ? onHint : offHint
         );