fixed pen hsv-cache invalidation for clones

HISTORY.md

@@ -35,6 +35,7 @@
 * updated iteration-composition library blocks with new loop-arrow symbols
 * updated list-utilities library blocks with new loop-arrow symbols
 * Threads: cleaned up CSV parser
+* Objects: fixed pen hsv-cache invalidation for clones
 
 ### 2019-01-21
 * let users make C-shape slots with loop arrow symbols. Sigh.

src/objects.js

@@ -1419,6 +1419,7 @@ SpriteMorph.prototype.fullCopy = function (forClone) {
     c.color = this.color.copy();
     c.blocksCache = {};
     c.paletteCache = {};
+    c.cachedHSV = c.color.hsv();
     arr = [];
     this.inheritedAttributes.forEach(function (att) {
         arr.push(att);