avoid_unnecessary_containers

Unnecessary instance of 'Container'.

The analyzer produces this diagnostic when a widget tree contains an instance of Container and the only argument to the constructor is child:.

The following code produces this diagnostic because the invocation of the Container constructor only has a child: argument:

import 'package:flutter/material.dart';
​
Widget buildRow() {
  return Container(child: Row(children: [Text('a'), Text('b')]));
}

If you intended to provide other arguments to the constructor, then add them:

import 'package:flutter/material.dart';
​
Widget buildRow() {
  return Container(
    color: Colors.red.shade100,
    child: Row(children: [Text('a'), Text('b')]),
  );
}

If no other arguments are needed, then unwrap the child widget:

import 'package:flutter/material.dart';
​
Widget buildRow() {
  return Row(children: [Text('a'), Text('b')]);
}