added new category feature to palette context menu

HISTORY.md

@@ -34,6 +34,7 @@
 * 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
 
 ### 2021-07-21
 * user defined custom block palettes, under construction

src/gui.js

@@ -4926,15 +4926,16 @@ IDE_Morph.prototype.createNewCategory = function () {
         this
     ).promptCategory(
         "New Palette",
-        'Category name',
-        new Color(0,214,126),
+        null,
+        new Color(0,116,143),
         this.world(),
         null, // pic
-        null // msg
+        'Blocks category name:' // msg
     );
 };
 
 IDE_Morph.prototype.addPaletteCategory = function (name, color) {
+    if (name === '') {return; }
     SpriteMorph.prototype.customCategories.set(name, color);
     this.createCategories();
     this.createPaletteHandle();

src/objects.js

@@ -3121,6 +3121,10 @@ SpriteMorph.prototype.freshPalette = function (category) {
                 }
             );
         }
+        menu.addItem(
+            'make a palette...',
+            () => this.parentThatIsA(IDE_Morph).createNewCategory()
+        );
         return menu;
     };