revert empty category indication for single palette mode

need to find a better mechanism...

HISTORY.md

@@ -68,7 +68,6 @@
 * gui, translations: removed old hidden "virtual keyboard" setting
 * gui: removed old hidden "project urls" setting
 * gui: removed hidden "cache inputs" setting (only used for debugging the evaluator)
-* gui, objects: indicate empty categories in single-palette mode 
 
 ### 2021-11-14
 * locale: contextualize translations

src/gui.js

@@ -1276,14 +1276,6 @@ IDE_Morph.prototype.createCategories = function () {
             if (cat.state) {
                 cat.scrollIntoView();
             }
-
-            // indicate whether a category is empty of blocks to show
-            // currently only supported in unified palette mode
-            if (myself.currentSprite.emptyCategoriesCache[cat.category]) {
-                cat.disable();
-            } else {
-                cat.enable();
-            }
         });
     };
 
@@ -1330,7 +1322,6 @@ IDE_Morph.prototype.createCategories = function () {
             true // has preview
         );
 
-        button.category = category;
         button.corner = 8;
         button.padding = 0;
         button.labelShadowOffset = new Point(-1, -1);
@@ -1367,7 +1358,6 @@ IDE_Morph.prototype.createCategories = function () {
             true // has preview
         );
 
-        button.category = category;
         button.corner = 8;
         button.padding = 0;
         button.labelShadowOffset = new Point(-1, -1);
@@ -2816,7 +2806,6 @@ IDE_Morph.prototype.selectSprite = function (sprite) {
     }
     this.currentSprite = sprite;
     this.scene.currentSprite = sprite;
-    this.categories.refresh(); // indicate empty categories in unified palette
     this.createPalette();
     this.createSpriteBar();
     this.createSpriteEditor();
@@ -6267,7 +6256,6 @@ IDE_Morph.prototype.toggleStageSize = function (isSmall, forcedRatio) {
 
 IDE_Morph.prototype.toggleUnifiedPalette = function () {
     this.setUnifiedPalette(!this.scene.unifiedPalette);
-    this.categories.refresh(); // update empty categories in single palette mode
 };
 
 IDE_Morph.prototype.setUnifiedPalette = function (bool) {

src/objects.js

@@ -1870,7 +1870,6 @@ SpriteMorph.prototype.init = function (globals) {
 
     this.primitivesCache = {}; // not to be serialized (!)
     this.paletteCache = {}; // not to be serialized (!)
-    this.emptyCategoriesCache = {}; // not to be serialized;
     this.rotationOffset = ZERO; // not to be serialized (!)
     this.idx = 0; // not to be serialized (!) - used for de-serialization
 
@@ -1936,7 +1935,6 @@ SpriteMorph.prototype.fullCopy = function (forClone) {
     c.freqPlayer = null;
     c.primitivesCache = {};
     c.paletteCache = {};
-    c.emptyCategoriesCache = {};
     c.imageData = {};
     c.cachedColorDimensions = c.color[this.penColorModel]();
     arr = [];
@@ -3013,14 +3011,6 @@ SpriteMorph.prototype.freshPalette = function (category) {
         searchButton,
         makeButton;
 
-    function isEmptyCategory(blocks) {
-        return blocks.filter(each =>
-            each instanceof BlockMorph && !myself.isHidingBlock(each)
-        ).length === 0;
-    }
-
-    this.emptyCategoriesCache = {};
-
     palette.owner = this;
     palette.padding = unit / 2;
     palette.color = this.paletteColor;
@@ -3113,11 +3103,6 @@ SpriteMorph.prototype.freshPalette = function (category) {
                         each !== '-' && each !== '=');
                 }
 
-                // update the empty categories cache
-                if (isEmptyCategory(primitives) &&  isEmptyCategory(customs)) {
-                    this.emptyCategoriesCache[category] = true;
-                }
-
                 return blocks.concat(
                     showHeader ? header : [],
                     primitives,
@@ -7787,7 +7772,6 @@ StageMorph.prototype.init = function (globals) {
     this.keysPressed = {}; // for handling keyboard events, do not persist
     this.primitivesCache = {}; // not to be serialized (!)
     this.paletteCache = {}; // not to be serialized (!)
-    this.emptyCategoriesCache = {}; // not to be serialized (!)
     this.lastAnswer = ''; // last user input, do not persist
     this.activeSounds = []; // do not persist