tweaked zoom-blocks sample scripts texture for block-fading

src/gui.js

@@ -5608,7 +5608,9 @@ IDE_Morph.prototype.userSetBlocksScale = function () {
     sample = new FrameMorph();
     sample.acceptsDrops = false;
     sample.color = IDE_Morph.prototype.groupColor;
-    sample.cachedTexture = this.scriptsPaneTexture;
+    if (SyntaxElementMorph.prototype.alpha > 0.8) {
+        sample.cachedTexture = this.scriptsPaneTexture;
+    }
     sample.setExtent(new Point(250, 180));
     scrpt.setPosition(sample.position().add(10));
     sample.add(scrpt);