Unused imports hint misses an unused import

[jwren]

Missing verification in unused imports hint:

if some file is imported using 2 different URIs, the second one should be flagged as unused. Example: in the analyzer workspace.dart file, include

import 'package:analyzer/src/workspace/bazel.dart';
import 'bazel.dart';

[srawlins]

Duplicate of #24073

[srawlins]

Oops, this is actually more a duplicate of #23788 or #32601; @lrhn 's explanation here is a good explanation:

That is the expected behavior. A library is identified by the URI used to point to it (after resolution and nomalization). If you use two different URIs to import what ends up being the same file, it's still treated as two different libraries...