added method to check whether an arbitrary block is hidden in the palette

HISTORY.md

@@ -43,6 +43,7 @@
 * threads: keep hidden variables out of the palette and drop-down menus
 * objects: added utilities to enumerate all palette blocks for hiding & showing
 * objects, threads, extensions: refactored block hiding methods
+* objects: added method to check whether an arbitrary block is hidden in the palette
 
 ### 2021-10-05
 * threads, store: added infrastructure for hiding individual variables in palette

src/objects.js

@@ -3248,6 +3248,19 @@ SpriteMorph.prototype.allPaletteBlocks = function () {
     return blocks.filter(each => each instanceof BlockMorph);
 };
 
+SpriteMorph.prototype.isHidingBlock = function (aBlock) {
+    if (aBlock.isCustomBlock) {
+        return (
+            aBlock.isGlobal ? aBlock.definition
+                : this.getLocalMethod(aBlock.semanticSpec)
+        ).isHelper;
+    }
+    if (aBlock.selector === 'reportGetVar') {
+        return this.variables.find(name).vars[aBlock.blockSpec].isHidden;
+    }
+    return StageMorph.prototype.hiddenPrimitives[aBlock.selector] === true;
+};
+
 SpriteMorph.prototype.changeBlockVisibility = function (aBlock, hideIt) {
     if (aBlock.isCustomBlock) {
         this.changeCustomBlockVisibility(aBlock, hideIt);
@@ -9394,6 +9407,8 @@ StageMorph.prototype.searchBlocks = SpriteMorph.prototype.searchBlocks;
 StageMorph.prototype.allPaletteBlocks
     = SpriteMorph.prototype.allPaletteBlocks;
 
+StageMorph.prototype.isHidingBlock = SpriteMorph.prototype.isHidingBlock;
+
 StageMorph.prototype.changeBlockVisibility
     = SpriteMorph.prototype.changeBlockVisibility;