…)"

This reverts commit ff0359d.

…ullability

I added a test to ensure the inferrer no longer crashes, but
#36046 still blocks the ability
for it to actually pass. The test is then added skipped until that
works.

We had two overloads of AbstractSymbolCompletionProvider.CreateItems,
once which handles the case of a single file and one that handles
linked files. The code is almost identical, but the linked file one
incorrectly handled the case of not having any symbols. Rather than
fixing the bug in just that branch, I'm refactoring it to simply
remove the second copy so both the single file and linked file cases
go through the same helper. The intent here is to avoid hiding simple
bugs that had nothing to do with linked files in the linked-file-only
path.

Fixes #36080 by virtue of
deleting the offending code entirely. No new tests are added since
I've confirmed that the existing tests (once the refactoring was
complete) would have been sufficient for discovering this problem.

Fix #36060: Group Completion Providers using IsExclusive

…with-method-inference

Fix crash where type inference doing method inference needs to drop nullability

Fixes #36346

Revert 35746

…-fatal-watson

Remove duplication in AbstractSymbolCompletionProvider.CreateItems