fixed script highlight when editing an input slot

snap.html

@@ -7,7 +7,7 @@
         <script src="src/morphic.js?version=2020-07-01"></script>
         <script src="src/symbols.js?version=2020-07-01"></script>
         <script src="src/widgets.js?version=2020-07-01"></script>
-        <script src="src/blocks.js?version=2020-07-01"></script>
+        <script src="src/blocks.js?version=2020-07-02"></script>
         <script src="src/threads.js?version=2020-07-02"></script>
         <script src="src/objects.js?version=2020-07-01"></script>
         <script src="src/gui.js?version=2020-07-01"></script>

src/blocks.js

@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2020-June-24';
+modules.blocks = '2020-July-02';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2056,8 +2056,10 @@ SyntaxElementMorph.prototype.fixLayout = function () {
     if (this instanceof BlockMorph && this.parent && this.parent.fixLayout) {
         this.parent.fixLayout();
         this.parent.changed();
+        if (this.parent instanceof SyntaxElementMorph) {
             return;
         }
+    }
     
     this.fixHighlight();
 };