[Flutter] Flutter 1.22.6 - url_launcher - Sending HTML email

I have two problems with the url_launcher: ^5.7.10 First Problem: When I try to send an email with html tag, on a real device, if I use Gmail application the body of my email is not well formated. I see the HTML tags. I tried with or without HTML5 doctype Second Problem: When I try to send an email with an Href tag the email body is cut at the equal sign.

My code is

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';

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

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'URL Launcher',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'URL Launcher'),
);
}
}

class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;

@override
_MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

Future<void> _sendMailHtml(String url) async {
if (await canLaunch(url)) {
await launch(
url
);
} else {
throw 'Could not launch $url';
}
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: ListView(
children: <Widget>[
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[

RaisedButton(
onPressed: () => setState(() {
_launched = _sendMailHtml('mailto:smith@example.org?subject=News&body=<h1>Header 1</h1><p>Paragraph</p>');
}),
child: const Text('Send Mail HTML'),
),
RaisedButton(
onPressed: () => setState(() {
_launched = _sendMailHtml('mailto:smith@example.org?subject=News&body=<h1>Header 1</h1><p>Paragraph</p><a href="https://google.com">Link</a><p>End of mail</p>');
}),
child: const Text('Send Mail HTML With HREF'),
),
],
),
],
),
);
}
}



My pubspec.yaml is

name: flutter_app
description: A new Flutter application.

publish_to: 'none' # Remove this line if you wish to publish to pub.dev

version: 1.0.0+1

environment:
sdk: ">=2.7.0 <3.0.0"

dependencies:
flutter:
sdk: flutter
url_launcher: ^5.7.10
cupertino_icons: ^1.0.0

dev_dependencies:
flutter_test:
sdk: flutter

# The following section is specific to Flutter.
flutter:

uses-material-design: true



I did not try with flutter 2 because my app is in production and I have some dependencies errors.

For the first problem if I try with another email app, I can see the good formatting.

On Android 10...

screenshots :

first problem on Gmail app

on other email app

Second problem with Gmail and anchor tag

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