[PATCH] D37101: [clangd] [WIP] Add support for snippet completions

[Raoul Wols via Phabricator via cfe-commits]

rwols created this revision.

Enhances CompletionItemsCollector in such a way that snippet
completions are presented to the client.
This is a work-in-progress. It currently works in Sublime Text 3 using the new
"LSP" plugin. In VSCode, the snippets are inserted into the buffer as plaintext
without any processing (bug). Untested in Atom.
See: https://github.com/Microsoft/language-server-protocol/blob/master/protocol.md#completion-request
See: https://github.com/Microsoft/vscode/blob/master/src/vs/editor/contrib/snippet/browser/snippet.md


https://reviews.llvm.org/D37101

Files:
  clangd/ClangdUnit.cpp
  clangd/Protocol.cpp

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