fix two zebra-coloring related glitches

… which I’ve introduced in trying to avoid “redundant” redraws earlier

blocks.js

@@ -695,11 +695,12 @@ SyntaxElementMorph.prototype.setColor = function (aColor, silently) {
     if (aColor) {
         if (!this.color.eq(aColor)) {
             this.color = aColor;
-            if (silently) {return; }
-            this.drawNew();
+            if (!silently) {this.drawNew(); }
             this.children.forEach(function (child) {
-                child.drawNew();
-                child.changed();
+                if (!silently || child instanceof TemplateSlotMorph) {
+                    child.drawNew();
+                    child.changed();
+                }
             });
             this.changed();
         }
@@ -4966,9 +4967,7 @@ RingMorph.prototype.dataType = function () {
 RingMorph.prototype.fixBlockColor = function (nearest, isForced) {
     var slot = this.parts()[0];
     RingMorph.uber.fixBlockColor.call(this, nearest, isForced);
-    if (slot instanceof RingCommandSlotMorph) {
-        slot.fixLayout();
-    }
+    slot.fixLayout();
 };
 
 // ScriptsMorph ////////////////////////////////////////////////////////

byob.js

@@ -1701,6 +1701,7 @@ BlockEditorMorph.prototype.init = function (definition, target) {
 
     scripts.add(proto);
     proto.fixBlockColor(null, true);
+    proto.drawNew();
 
     this.definition.scripts.forEach(function (element) {
         block = element.fullCopy();