[clang] [clang-tools-extra] clangd: Extend reference search with constructor calls through forwarding (PR #169742)

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timon-ul wrote:

> Adding a carveout for likely-forwarding-functions there (to traverse them without regard to what shouldIndexFile says) seems to fix the issue.

Maybe I do not quite follow yet, I implemented the same check I have for the index and it does not work. Now you also said the body for the template might be missing, I did not care about that, so maybe I should? The real issue is testing if it works or not right now is a pain, because I just let it reindex our codebase which takes me over an hour. 

https://github.com/llvm/llvm-project/pull/169742