Repository: flutter
Issue: TextField cursor overlaps hint text when text aligned to end
Labels: a: text input,framework,f: material design,has reproducible steps,P2,found in release: 3.3,found in release: 3.7,team-text-input,triaged-text-input

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Cursor overlap hint text when text aligned to end. The problem only occurs only on ios, on Android everything is fine.

## Steps to Reproduce

Code to reproduce:
```
void main() {
   runApp(MyApp());
}

class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return const MaterialApp(
       home: Scaffold(
         body: Center(
           child: Padding(
             padding: EdgeInsets.all(60),
             child: TextField(
               textAlign: TextAlign.end,
               decoration: InputDecoration(hintText: "hint"),
             ),
           )
         ),
       ),
     );
   }
}
```

**Expected results:** <!-- what did you want to see? -->
Cursor should occur after hint text.

**Actual results:** <!-- what did you see? -->
Cursor overlap last hint sign.

![obraz](https://user-images.githubusercontent.com/3773312/102076804-98d9c080-3e08-11eb-91ef-bf57bf2dc37b.png)


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<!-- Finally, paste the output of running `flutter doctor -v` here. -->

## flutter doctor -v result:
```
[✓] Flutter (Channel stable, 1.22.5, on Mac OS X 10.15.7 19H2 darwin-x64, locale pl-PL)
     • Flutter version 1.22.5 at /Users/Shared/flutter
     • Framework revision 7891006299 (4 days ago), 2020-12-10 11:54:40-0800
     • Engine revision ae90085a84
     • Dart version 2.10.4

[✗] Android toolchain - develop for Android devices
     ✗ Unable to locate Android SDK.
       Install Android Studio from: https://developer.android.com/studio/index.html
       On first launch it will assist you in installing the Android SDK components.
       (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
       If the Android SDK has been installed to a custom location, set ANDROID_SDK_ROOT to that location.
       You may also want to add it to your PATH environment variable.



[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
     • Xcode at /Applications/Xcode.app/Contents/Developer
     • Xcode 12.0.1, Build version 12A7300
     • CocoaPods version 1.9.3

[✓] Android Studio (version 3.5)
     • Android Studio at /Applications/Android Studio.app/Contents
     • Flutter plugin version 44.0.1
     • Dart plugin version 191.8593
     • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.50.0)
     • VS Code at /Applications/Visual Studio Code.app/Contents
     • Flutter extension version 3.17.0

[✓] Connected device (2 available)
     • iPhone (Mateusz) (mobile)           • 00008030-001A21022E46802E  • ios • iOS 14.0.1
     • iPhone SE (2nd generation) (mobile)        •CFC6903A-80EE-493E-948F-5B0C85802D41 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-0 (simulator)
```



</details>