added delete category feature to palette context menu

HISTORY.md

@@ -34,9 +34,10 @@
 * objects: enabled custom categories for the stage
 * store: load user defined palettes
 * gui: restore custom palettes when activating a scene
-* added new category feature to palette context menu
+* objects: added new category feature to palette context menu
 * gui, objects, scenes: fixed costume maximum extent
 * gui: cleaned up hidden menu
+* objects, gui: added delete category feature to palette context menu
 
 ### 2021-07-21
 * user defined custom block palettes, under construction

src/gui.js

@@ -4933,6 +4933,36 @@ IDE_Morph.prototype.addPaletteCategory = function (name, color) {
     this.fixLayout();
 };
 
+IDE_Morph.prototype.deleteUserCategory = function () {
+    var menu = new MenuMorph(
+        this.deletePaletteCategory,
+        null,
+        this
+    );
+    SpriteMorph.prototype.customCategories.forEach((clr, name) =>
+        menu.addItem(
+            name,
+            name,
+            null,
+            null,
+            null,
+            null,
+            null,
+            null,
+            true // verbatim - don't translate
+        )
+    );
+    menu.popUpAtHand(this.world());
+};
+
+IDE_Morph.prototype.deletePaletteCategory = function (name) {
+    SpriteMorph.prototype.customCategories.delete(name);
+    this.createCategories();
+    this.createPaletteHandle();
+    this.categories.fixLayout();
+    this.fixLayout();
+};
+
 IDE_Morph.prototype.save = function () {
     // temporary hack - only allow exporting projects to disk
     // when running Snap! locally without a web server

src/objects.js

@@ -3121,10 +3121,17 @@ SpriteMorph.prototype.freshPalette = function (category) {
                 }
             );
         }
+        menu.addLine();
         menu.addItem(
-            'make a palette...',
+            'make a category...',
             () => this.parentThatIsA(IDE_Morph).createNewCategory()
         );
+        if (SpriteMorph.prototype.customCategories.size) {
+            menu.addItem(
+                'delete a category...',
+                () => this.parentThatIsA(IDE_Morph).deleteUserCategory()
+            );
+        }
         return menu;
     };