UI: Interleave essentials modifiers in "Generate" menu

Hardocde the position of the essentials assets in the menu,
for consistent alphabetical order and a clearer indication of
the different between the nodes and builtin "Array" modifiers
(the old one is now called "Array (Legacy)").

Pull Request: https://projects.blender.org/blender/blender/pulls/146887

source/blender/editors/include/ED_object.hh

@@ -609,6 +609,8 @@ void data_xform_by_mat4(XFormObjectData &xod, const float4x4 &transform);
 void data_xform_restore(XFormObjectData &xod);
 void data_xform_tag_update(XFormObjectData &xod);
 
-void ui_template_modifier_asset_menu_items(uiLayout &layout, StringRef catalog_path);
+void ui_template_modifier_asset_menu_items(uiLayout &layout,
+                                           StringRef catalog_path,
+                                           bool skip_essentials);
 
 }  // namespace blender::ed::object

source/blender/editors/object/add_modifier_assets.cc

@@ -85,6 +85,7 @@ static void catalog_assets_draw(const bContext *C, Menu *menu)
   if (!menu_path) {
     return;
   }
+  const int skip_essentials = CTX_data_int_get(C, "skip_essentials").value_or(0);
   const Span<asset_system::AssetRepresentation *> assets = tree.assets_per_path.lookup(
       menu_path->data());
   const asset_system::AssetCatalogTreeItem *catalog_item = tree.catalogs.find_item(
@@ -96,16 +97,30 @@ static void catalog_assets_draw(const bContext *C, Menu *menu)
   }
 
   uiLayout *layout = menu->layout;
-  layout->separator();
+
+  bool first = true;
+  const auto ensure_separator = [&]() {
+    if (first) {
+      layout->separator();
+      first = false;
+    }
+  };
 
   wmOperatorType *ot = WM_operatortype_find("OBJECT_OT_modifier_add_node_group", true);
   for (const asset_system::AssetRepresentation *asset : assets) {
+    if (skip_essentials) {
+      if (asset->owner_asset_library().library_reference()->type == ASSET_LIBRARY_ESSENTIALS) {
+        continue;
+      }
+    }
+    ensure_separator();
     PointerRNA props_ptr = layout->op(
         ot, IFACE_(asset->get_name()), ICON_NONE, wm::OpCallContext::InvokeDefault, UI_ITEM_NONE);
     asset::operator_asset_reference_props_set(*asset, props_ptr);
   }
 
   catalog_item->foreach_child([&](const asset_system::AssetCatalogTreeItem &item) {
+    ensure_separator();
     asset::draw_menu_for_catalog(item, "OBJECT_MT_add_modifier_catalog_assets", *layout);
   });
 }
@@ -388,7 +403,9 @@ void object_modifier_add_asset_register()
   WM_operatortype_append(OBJECT_OT_modifier_add_node_group);
 }
 
-void ui_template_modifier_asset_menu_items(uiLayout &layout, const StringRef catalog_path)
+void ui_template_modifier_asset_menu_items(uiLayout &layout,
+                                           const StringRef catalog_path,
+                                           const bool skip_essentials)
 {
   asset::AssetItemTree &tree = *get_static_item_tree();
   const asset_system::AssetCatalogTreeItem *item = tree.catalogs.find_root_item(catalog_path);
@@ -400,9 +417,9 @@ void ui_template_modifier_asset_menu_items(uiLayout &layout, const StringRef cat
   if (!all_library) {
     return;
   }
-  layout.separator();
   uiLayout *col = &layout.column(false);
   col->context_string_set("asset_catalog_path", item->catalog_path().str());
+  col->context_int_set("skip_essentials", skip_essentials);
   col->menu_contents("OBJECT_MT_add_modifier_catalog_assets");
 }
 

source/blender/makesrna/intern/rna_ui_api.cc

@@ -915,10 +915,12 @@ static void rna_uiLayout_template_node_operator_asset_menu_items(uiLayout *layou
 }
 
 static void rna_uiLayout_template_modifier_asset_menu_items(uiLayout *layout,
-                                                            const char *catalog_path)
+                                                            const char *catalog_path,
+                                                            const bool skip_essentials)
 {
   using namespace blender;
-  ed::object::ui_template_modifier_asset_menu_items(*layout, StringRef(catalog_path));
+  ed::object::ui_template_modifier_asset_menu_items(
+      *layout, StringRef(catalog_path), skip_essentials);
 }
 
 static void rna_uiLayout_template_node_operator_root_items(uiLayout *layout, bContext *C)
@@ -2150,6 +2152,7 @@ void RNA_api_ui_layout(StructRNA *srna)
                           "template_modifier_asset_menu_items",
                           "rna_uiLayout_template_modifier_asset_menu_items");
   parm = RNA_def_string(func, "catalog_path", nullptr, 0, "", "");
+  parm = RNA_def_boolean(func, "skip_essentials", false, "", "");
 
   func = RNA_def_function(srna,
                           "template_node_operator_asset_menu_items",