[PATCH] D43648: [clangd] Debounce streams of updates.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added reviewers: hokein, ilya-biryukov.
Herald added subscribers: cfe-commits, ioeric, jkorous-apple, klimek.

Don't actually start building ASTs for new revisions until either:

- 500ms have passed since the last revision, or
- we actually need the revision for something (or to unblock the queue)

In practice, this avoids the "first keystroke results in diagnostics" problem.
This is kind of awkward to test, and the test is pretty bad.
It can be observed nicely by capturing a trace, though.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D43648

Files:
  clangd/TUScheduler.cpp
  clangd/TUScheduler.h
  unittests/clangd/TUSchedulerTests.cpp

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