Revert "2nd merge optimisation"

This reverts commit c9e7f1ccfa6ff028151a5b7cf0dc2f60303dd831.

updater.bat

@@ -39,7 +39,7 @@ IF DEFINED _updateb (
 	IF NOT "!_myname:~0,9!"=="[updated]" (
 		ECHO Checking updater version...
 		ECHO.
-		IF EXIST "[updated]!_myname!.bat" ( DEL /F "[updated]!_myname!.bat" )
+		DEL /F "[updated]!_myname!.bat" 2>nul
 		REM Uncomment the next line and comment the powershell call for testing.
 		REM COPY /B /V /Y "!_myname!.bat" "[updated]!_myname!.bat"
 		(
@@ -207,38 +207,37 @@ EXIT /B
 
 REM ###### Merge function ######
 :merge
+DEL /F %2 2>nul
 SETLOCAL disabledelayedexpansion
-(
-	FOR /F "tokens=1,* delims=]" %%G IN ('find /n /v "" ^< "%~1"') DO (
-		SET "_pref=%%H"
-		SETLOCAL enabledelayedexpansion
-		SET "_temp=!_pref: =!"
-		IF /I "user_pref"=="!_temp:~0,9!" (
-			IF /I NOT "user.js.parrot"=="!_temp:~12,14!" (
-				FOR /F "delims=," %%S IN ("!_pref!") DO (
-					SET "_pref=%%S"
-				)
-				SET _pref=!_pref:"=""!
-				FIND /I "!_pref!" %~2 >nul 2>&1
-				IF ERRORLEVEL 1 (
-					FOR /F "tokens=* delims=" %%X IN ('FIND /I "!_pref!" %~1') DO (
-						SET "_temp=%%X"
-						SET "_temp=!_temp: =!"
-						IF /I "user_pref"=="!_temp:~0,9!" (
-							SET "_pref=%%X"
-						)
+FOR /F "tokens=1,* delims=]" %%G IN ('find /n /v "" ^< "%~1"') DO (
+	SET "_pref=%%H"
+	SETLOCAL enabledelayedexpansion
+	SET "_temp=!_pref: =!"
+	IF /I "user_pref"=="!_temp:~0,9!" (
+		IF /I NOT "user.js.parrot"=="!_temp:~12,14!" (
+			FOR /F "delims=," %%S IN ("!_pref!") DO (
+				SET "_pref=%%S"
+			)
+			SET _pref=!_pref:"=""!
+			FIND /I "!_pref!" %~2 >nul 2>&1
+			IF ERRORLEVEL 1 (
+				FOR /F "tokens=* delims=" %%X IN ('FIND /I "!_pref!" %~1') DO (
+					SET "_temp=%%X"
+					SET "_temp=!_temp: =!"
+					IF /I "user_pref"=="!_temp:~0,9!" (
+						SET "_pref=%%X"
 					)
-					ECHO(!_pref!
 				)
-			) ELSE (
-				ECHO(!_pref!
+				ECHO(!_pref!>>%~2
 			)
 		) ELSE (
-			ECHO(!_pref!
+			ECHO(!_pref!>>%~2
 		)
-		ENDLOCAL
+	) ELSE (
+		ECHO(!_pref!>>%~2
 	)
-)>%~2
+	ENDLOCAL
+)
 ENDLOCAL
 DEL /F %1 >nul
 GOTO :EOF