[PATCH] D64296: [clangd] Show documentation in hover, and fetch docs from index if needed.

[Sam McCall via Phabricator via llvm-commits]

sammccall created this revision.
sammccall added a reviewer: kadircet.
Herald added subscribers: llvm-commits, arphaman, jkorous, MaskRay, ilya-biryukov.
Herald added a project: LLVM.

I assume showing docs is going to be part of structured hover rendering, but
it's unclear whether that's going to make clangd 9 so this is low-hanging fruit.

(Also fixes a bug uncovered in FormattedString's plain text output: need blank
lines when text follows codeblocks)


Repository:
  rL LLVM

https://reviews.llvm.org/D64296

Files:
  clang-tools-extra/clangd/ClangdServer.cpp
  clang-tools-extra/clangd/FormattedString.cpp
  clang-tools-extra/clangd/XRefs.cpp
  clang-tools-extra/clangd/XRefs.h
  clang-tools-extra/clangd/unittests/FormattedStringTests.cpp
  clang-tools-extra/clangd/unittests/XRefsTests.cpp

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