use_full_hex_values_for_flutter_colors

Instances of 'Color' should be created using an 8-digit hexadecimal integer (such as '0xFFFFFFFF').

The analyzer produces this diagnostic when the argument to the constructor of the Color class is a literal integer that isn't represented as an 8-digit hexadecimal integer.

The following code produces this diagnostic because the argument (1) isn't represented as an 8-digit hexadecimal integer:

import 'package:flutter/material.dart';

Color c = Color(1);

Convert the representation to be an 8-digit hexadecimal integer:

import 'package:flutter/material.dart';

Color c = Color(0x00000001);

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