[PATCH] D51438: [clangd] Run SignatureHelp using an up-to-date preamble, waiting if needed.

[Sam McCall via Phabricator via cfe-commits]

sammccall added a comment.

(This needs new TUScheduler tests for `Consistent` mode, but would like some feedback on the implementation first)


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D51438