Fix "Go to definition" for GDScript type hints

Fixes #68475.

modules/gdscript/gdscript_editor.cpp

@@ -3533,6 +3533,33 @@ static Error _lookup_symbol_from_base(const GDScriptParser::DataType &p_base, co
 				return OK;
 			}
 		} break;
+		case GDScriptParser::COMPLETION_TYPE_ATTRIBUTE: {
+			if (context.node == nullptr || context.node->type != GDScriptParser::Node::TYPE) {
+				break;
+			}
+			const GDScriptParser::TypeNode *type = static_cast<const GDScriptParser::TypeNode *>(context.node);
+
+			GDScriptParser::DataType base_type;
+			const GDScriptParser::IdentifierNode *prev = nullptr;
+			for (const GDScriptParser::IdentifierNode *E : type->type_chain) {
+				if (E->name == p_symbol && prev != nullptr) {
+					base_type = prev->get_datatype();
+					break;
+				}
+				prev = E;
+			}
+			if (base_type.kind != GDScriptParser::DataType::CLASS) {
+				GDScriptCompletionIdentifier base;
+				if (!_guess_expression_type(context, prev, base)) {
+					break;
+				}
+				base_type = base.type;
+			}
+
+			if (_lookup_symbol_from_base(base_type, p_symbol, is_function, r_result) == OK) {
+				return OK;
+			}
+		} break;
 		case GDScriptParser::COMPLETION_OVERRIDE_METHOD: {
 			GDScriptParser::DataType base_type = context.current_class->base_type;
 
@@ -3540,6 +3567,7 @@ static Error _lookup_symbol_from_base(const GDScriptParser::DataType &p_base, co
 				return OK;
 			}
 		} break;
+		case GDScriptParser::COMPLETION_PROPERTY_DECLARATION_OR_TYPE:
 		case GDScriptParser::COMPLETION_TYPE_NAME_OR_VOID:
 		case GDScriptParser::COMPLETION_TYPE_NAME: {
 			GDScriptParser::DataType base_type = context.current_class->get_datatype();