Make Lookup Symbol recognize assert, preload, and yield in the script editor

modules/gdscript/gdscript_editor.cpp

@@ -3300,7 +3300,7 @@ static Error _lookup_symbol_from_base(const GDScriptParser::DataType &p_base, co
 }
 
 Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol, const String &p_path, Object *p_owner, LookupResult &r_result) {
-	//before parsing, try the usual stuff
+	// Before parsing, try the usual stuff.
 	if (ClassDB::class_exists(p_symbol)) {
 		r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS;
 		r_result.class_name = p_symbol;
@@ -3534,16 +3534,24 @@ Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol
 		}
 	}
 
+	// Must check GDScript functions after parsing to ensure functions like Array.max() are handled correctly.
+	bool function_in_gdscript_functions = false;
 	for (int i = 0; i < GDScriptFunctions::FUNC_MAX; i++) {
-		// this has to get run after parsing because otherwise functions like Array.max() will trigger it
 		if (GDScriptFunctions::get_func_name(GDScriptFunctions::Function(i)) == p_symbol) {
-			r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_METHOD;
-			r_result.class_name = "@GDScript";
-			r_result.class_member = p_symbol;
-			return OK;
+			function_in_gdscript_functions = true;
+			break;
 		}
 	}
 
+	// Need special checks for assert, preload, and yield as they are technically
+	// keywords, so are not registered in GDScriptFunctions.
+	if (function_in_gdscript_functions || "yield" == p_symbol || "assert" == p_symbol || "preload" == p_symbol) {
+		r_result.type = ScriptLanguage::LookupResult::RESULT_CLASS_METHOD;
+		r_result.class_name = "@GDScript";
+		r_result.class_member = p_symbol;
+		return OK;
+	}
+
 	return ERR_CANT_RESOLVE;
 }