fix cache clearing for primitive hiding

src/blocks.js

@@ -3237,11 +3237,22 @@ BlockMorph.prototype.developersMenu = function () {
     return menu;
 };
 
-BlockMorph.prototype.hidePrimitive = function () {
-    var ide = this.parentThatIsA(IDE_Morph);
+BlockMorph.prototype.hidePrimitive = function (args) {
+    var ide = this.parentThatIsA(IDE_Morph),
+        dict,
+        cat;
     if (!ide) {return; }
     StageMorph.prototype.hiddenPrimitives[this.selector] = true;
-    ide.flushBlocksCache(ide.currentCategory);
+    dict = {
+        doWarp: 'control',
+        reifyScript: 'operators',
+        reifyReporter: 'operators',
+        reifyPredicate: 'operators',
+        doDeclareVariables: 'variables'
+    };
+    cat = dict[this.selector] || this.category;
+    if (cat === 'lists') {cat = 'variables'; }
+    ide.flushBlocksCache(cat);
     ide.refreshPalette();
 };
 

src/gui.js

@@ -5791,9 +5791,11 @@ IDE_Morph.prototype.flushPaletteCache = function (category) {
     // if no category is specified, the whole cache gets flushed
     if (category) {
         this.stage.paletteCache[category] = null;
+        this.stage.paletteCache.unified = null;
         this.stage.children.forEach(m => {
             if (m instanceof SpriteMorph) {
                 m.paletteCache[category] = null;
+                m.paletteCache.unified = null;
             }
         });
     } else {