Missing inspections for unused class, unused public methods and properties

[ph55]

Feature request / improvement.

Classes missing some inspections for

• Unused class itself
• Unused public properties
• Unused public methods

Steps to Reproduce

class Test {
  final unusedPublicProp = 0;
  final _unusedPrivateProp = 0;

  unusedPublic(){
    return 0;
  }

  int _unusedPrivate(){
    return 0;
  }
}

There is no inspection highlight for unused public methods/properties and class:

Message only pop-up when you Ctrl+click on method/property/class to find usages:

This issue was moved by pq to dart-lang/sdk#42358.