[clang] [FixIt] Improve Source Ranges and Fix-It Hints for Unused Lambda Captures #106445 (PR #117953)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

Only a quick scroll through here, and @cor3ntin is the right one to review this, but the test coverage for the new diagnostics seems non-existant.  And much of the test changes themselves are just changing what looks like they are valid tests.

Please ADD tests for your new things, and make it clear what/why you're changing existing tests in this way.

https://github.com/llvm/llvm-project/pull/117953