dartdoc claims LibraryElement.== can not distinguish between non-normalized import paths

[jcollins-g]

... but the analyzer seems to handle them correctly and there is even a test for it.

Here is the claim:

dartdoc/lib/src/model/inheriting_container.dart

Line 408 in c45302c

// [definingLibrary] may be null if [element] has been imported or

It's possible that this was a bug that was fixed in the analyzer a long time ago, or the presence of this problem was due to the unorthodox way dartdoc used to initialize the element model, or some other bug somewhere else, or who knows.

Prove that somehow the analyzer is still responsible for this situation, or resolve/remove the various workarounds including the "unable to find defining library" warning if it is impossible.