Improve handling of custom types

doc/classes/EditorPlugin.xml

@@ -406,6 +406,7 @@
 				When a given node or resource is selected, the base type will be instantiated (e.g. "Node3D", "Control", "Resource"), then the script will be loaded and set to this object.
 				You can use the virtual method [method _handles] to check if your custom object is being edited by checking the script or using the [code]is[/code] keyword.
 				During run-time, this will be a simple object with a script so this function does not need to be called then.
+				[b]Note:[/b] Custom types added this way are not true classes. They are just a helper to create a node with specific script.
 			</description>
 		</method>
 		<method name="add_debugger_plugin">

editor/create_dialog.cpp

@@ -665,7 +665,7 @@ void CreateDialog::_save_and_update_favorite_list() {
 			for (int i = 0; i < favorite_list.size(); i++) {
 				String l = favorite_list[i];
 				String name = l.get_slicec(' ', 0);
-				if (!(ClassDB::class_exists(name) || ScriptServer::is_global_class(name))) {
+				if (!EditorNode::get_editor_data().is_type_recognized(name)) {
 					continue;
 				}
 				f->store_line(l);
@@ -692,7 +692,7 @@ void CreateDialog::_load_favorites_and_history() {
 			String l = f->get_line().strip_edges();
 			String name = l.get_slicec(' ', 0);
 
-			if ((ClassDB::class_exists(name) || ScriptServer::is_global_class(name)) && !_is_class_disabled_by_feature_profile(name)) {
+			if (EditorNode::get_editor_data().is_type_recognized(name) && !_is_class_disabled_by_feature_profile(name)) {
 				recent->add_item(l, EditorNode::get_singleton()->get_class_icon(name, icon_fallback));
 			}
 		}

editor/editor_data.cpp

@@ -509,6 +509,32 @@ Variant EditorData::instance_custom_type(const String &p_type, const String &p_i
 	return Variant();
 }
 
+const EditorData::CustomType *EditorData::get_custom_type_by_name(const String &p_type) const {
+	for (const KeyValue<String, Vector<CustomType>> &E : custom_types) {
+		for (const CustomType &F : E.value) {
+			if (F.name == p_type) {
+				return &F;
+			}
+		}
+	}
+	return nullptr;
+}
+
+const EditorData::CustomType *EditorData::get_custom_type_by_path(const String &p_path) const {
+	for (const KeyValue<String, Vector<CustomType>> &E : custom_types) {
+		for (const CustomType &F : E.value) {
+			if (F.script->get_path() == p_path) {
+				return &F;
+			}
+		}
+	}
+	return nullptr;
+}
+
+bool EditorData::is_type_recognized(const String &p_type) const {
+	return ClassDB::class_exists(p_type) || ScriptServer::is_global_class(p_type) || get_custom_type_by_name(p_type);
+}
+
 void EditorData::remove_custom_type(const String &p_type) {
 	for (KeyValue<String, Vector<CustomType>> &E : custom_types) {
 		for (int i = 0; i < E.value.size(); i++) {

editor/editor_data.h

@@ -184,6 +184,9 @@ public:
 	Variant instance_custom_type(const String &p_type, const String &p_inherits);
 	void remove_custom_type(const String &p_type);
 	const HashMap<String, Vector<CustomType>> &get_custom_types() const { return custom_types; }
+	const CustomType *get_custom_type_by_name(const String &p_name) const;
+	const CustomType *get_custom_type_by_path(const String &p_path) const;
+	bool is_type_recognized(const String &p_type) const;
 
 	void instantiate_object_properties(Object *p_object);
 

editor/editor_inspector.cpp

@@ -2738,7 +2738,7 @@ void EditorInspector::update_tree() {
 			doc_name = p.name;
 
 			// Set the category icon.
-			if (!ClassDB::class_exists(type) && !ScriptServer::is_global_class(type) && p.hint_string.length() && FileAccess::exists(p.hint_string)) {
+			if (!EditorNode::get_editor_data().is_type_recognized(type) && p.hint_string.length() && FileAccess::exists(p.hint_string)) {
 				// If we have a category inside a script, search for the first script with a valid icon.
 				Ref<Script> script = ResourceLoader::load(p.hint_string, "Script");
 				StringName base_type;
@@ -2757,10 +2757,16 @@ void EditorInspector::update_tree() {
 				while (script.is_valid()) {
 					name = EditorNode::get_editor_data().script_class_get_name(script->get_path());
 					String icon_path = EditorNode::get_editor_data().script_class_get_icon_path(name);
-					if (name != StringName() && icon_path.length()) {
+					if (name != StringName() && !icon_path.is_empty()) {
 						category->icon = ResourceLoader::load(icon_path, "Texture");
 						break;
 					}
+
+					const EditorData::CustomType *ctype = EditorNode::get_editor_data().get_custom_type_by_path(script->get_path());
+					if (ctype) {
+						category->icon = ctype->icon;
+						break;
+					}
 					script = script->get_base_script();
 				}
 				if (category->icon.is_null() && has_theme_icon(base_type, SNAME("EditorIcons"))) {

editor/editor_node.cpp

@@ -4338,16 +4338,8 @@ Ref<Texture2D> EditorNode::get_class_icon(const String &p_class, const String &p
 		}
 	}
 
-	const HashMap<String, Vector<EditorData::CustomType>> &p_map = EditorNode::get_editor_data().get_custom_types();
-	for (const KeyValue<String, Vector<EditorData::CustomType>> &E : p_map) {
-		const Vector<EditorData::CustomType> &ct = E.value;
-		for (int i = 0; i < ct.size(); ++i) {
-			if (ct[i].name == p_class) {
-				if (ct[i].icon.is_valid()) {
-					return ct[i].icon;
-				}
-			}
-		}
+	if (const EditorData::CustomType *ctype = EditorNode::get_editor_data().get_custom_type_by_name(p_class)) {
+		return ctype->icon;
 	}
 
 	if (gui_base->has_theme_icon(p_class, SNAME("EditorIcons"))) {

editor/script_create_dialog.cpp

@@ -202,7 +202,7 @@ bool ScriptCreateDialog::_validate_parent(const String &p_string) {
 		}
 	}
 
-	return ClassDB::class_exists(p_string) || ScriptServer::is_global_class(p_string);
+	return EditorNode::get_editor_data().is_type_recognized(p_string);
 }
 
 bool ScriptCreateDialog::_validate_class(const String &p_string) {
@@ -372,7 +372,15 @@ void ScriptCreateDialog::_create_new() {
 
 	const ScriptLanguage::ScriptTemplate sinfo = _get_current_template();
 
-	scr = ScriptServer::get_language(language_menu->get_selected())->make_template(sinfo.content, cname_param, parent_name->get_text());
+	String parent_class = parent_name->get_text();
+	if (!ClassDB::class_exists(parent_class) && !ScriptServer::is_global_class(parent_class)) {
+		// If base is a custom type, replace with script path instead.
+		const EditorData::CustomType *type = EditorNode::get_editor_data().get_custom_type_by_name(parent_class);
+		ERR_FAIL_NULL(type);
+		parent_class = "\"" + type->script->get_path() + "\"";
+	}
+
+	scr = ScriptServer::get_language(language_menu->get_selected())->make_template(sinfo.content, cname_param, parent_class);
 
 	if (has_named_classes) {
 		String cname = class_name->get_text();