Fixes empty paste null reference + Allow to copy/paste group using hierarchy

Author: Raftatul

editor/inspector/editor_inspector.cpp

@@ -1790,7 +1790,7 @@ void EditorInspectorCategory::_handle_menu_option(int p_option) {
 			Vector<String> properties;
 			_collect_properties(object, properties);
 
-			clipboard["category_name"] = label;
+			clipboard["path"] = doc_class_name;
 			for (String property_name : properties) {
 				clipboard[property_name] = object->get(property_name);
 			}
@@ -1800,7 +1800,12 @@ void EditorInspectorCategory::_handle_menu_option(int p_option) {
 		case MENU_PASTE_VALUE: {
 			Object *object = EditorInterface::get_singleton()->get_inspector()->get_edited_object();
 			Dictionary clipboard = InspectorDock::get_inspector_singleton()->get_property_clipboard();
-			String category_name = clipboard["category_name"];
+			String category_name = clipboard["path"];
+
+			if (category_name != doc_class_name) {
+				break;
+			}
+
 			String action_name = "Set category " + category_name;
 
 			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
@@ -2548,7 +2553,6 @@ void EditorInspectorSection::_collect_properties(Vector<String> &p_properties) c
 			current_category = prop_info.name;
 			current_group = "";
 			current_subgroup = "";
-
 			continue;
 		}
 		if (!(prop_info.usage & PROPERTY_USAGE_EDITOR)) {
@@ -2573,28 +2577,36 @@ void EditorInspectorSection::_collect_properties(Vector<String> &p_properties) c
 	}
 }
 
-void EditorInspectorSection::menu_option(int p_option) {
+void EditorInspectorSection::menu_option(int p_option) const {
 	switch (p_option) {
 		case MENU_COPY_VALUE: {
 			Vector<String> properties;
 			Dictionary clipboard;
 			_collect_properties(properties);
 
-			clipboard["group_name"] = section;
+			clipboard["path"] = get_inspector_path();
 			for (String property_name : properties) {
 				clipboard[property_name] = object->get(property_name);
 			}
 			InspectorDock::get_inspector_singleton()->set_property_clipboard(clipboard);
 		} break;
 		case MENU_PASTE_VALUE: {
 			Dictionary clipboard = InspectorDock::get_inspector_singleton()->get_property_clipboard();
-			String group_name = clipboard["group_name"];
+			String group_name = clipboard["path"];
+
+			if (!get_inspector_path().begins_with(group_name)) {
+				break;
+			}
+
+			Vector<String> properties;
 			String action_name = "Set group " + group_name;
 
+			_collect_properties(properties);
+
 			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 			undo_redo->create_action(action_name);
 
-			for (String property_name : clipboard.keys()) {
+			for (String property_name : properties) {
 				Variant value = clipboard[property_name];
 				undo_redo->add_do_property(object, property_name, value);
 				undo_redo->add_undo_property(object, property_name, object->get(property_name));

editor/inspector/editor_inspector.h

@@ -490,7 +490,7 @@ class EditorInspectorSection : public Container {
 
 	void _update_popup();
 	void _collect_properties(Vector<String> &p_properties) const;
-	void menu_option(int p_option);
+	void menu_option(int p_option) const;
 
 	EditorInspectorSection();
 	~EditorInspectorSection();