[clangd] Show background index status using LSP 3.15 work-done progress notifications
Summary: It simply shows the completed/total items on the background queue, e.g. indexing: 233/1000 The denominator is reset to zero every time the queue goes idle. The protocol is fairly complicated here (requires creating a remote "progress" resource before sending updates). We implement the full protocol, but I've added an extension allowing it to be skipped to reduce the burden on clients - in particular the lit test takes this shortcut. The addition of background index progress to DiagnosticConsumer seems ridiculous at first glance, but I believe that interface is trending in the direction of "ClangdServer callbacks" anyway. It's due for a rename, but otherwise actually fits. Reviewers: kadircet, usaxena95 Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, jfb, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D73218
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