analysis_options's exclude is not respected with parts

[a14n]

Tested with 2.0.0 and 2.1.0-dev.5.0 and the following files:

• analysis_options.yaml:

analyzer:
  exclude:
  - '**.g.dart'
linter:
  rules:
  - unnecessary_new

• lib/a.dart:

part 'a.g.dart';
final a = new List();

• lib/a.g.dart:

part of 'a.dart';
final b = new List();

I get the result:

$ dartanalyzer .
Analyzing test...
  lint • Unnecessary new keyword at lib/a.dart:2:11 • unnecessary_new
  lint • Unnecessary new keyword at lib/a.g.dart:2:11 • unnecessary_new
2 lints found.

Regarding the exclude section lint on a.g.dart shouldn't be there.

As the generated file is not really modifiable this issue is quite annoying when you use package like source_gen.

[a14n]

/cc @bwilkerson @scheglov

[MichaelRFairhurst]

This is a duplicate of #25551.

I really hope we solve this soon..!