As you can see, there is am empty space on the Text right side, how can i remove it.

Use CustomPainter can solve this problem but I need to calculate text width first.

Is there another way to remove this empty space?

example code:

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
      body: Center(
        child: Row(
          children: [
            Flexible(
              child: Container(
                color: Colors.green,
                 child: Text(
                  "TEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXTTEXT",
                  style: TextStyle(fontSize: 20)
                )
              )
            )
          ],
        )
      )
      )
    );
  }
}

dartPad: https://dartpad.dev