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Yi Ming
f486f1742e
Problem: Users of the Roslyn (C#) LSP have encountered significant delays when retrieving pull diagnostics in large documents while using Neovim. For instance, diagnostics in a 2000-line .cs file can take over 20 seconds to display after edits in Neovim, whereas in VS Code, diagnostics for the same file are displayed almost instantly. As [mparq noted](https://github.com/seblj/roslyn.nvim/issues/93#issuecomment-2508940330) in https://github.com/seblj/roslyn.nvim/issues/93, VS Code leverages additional parameters specified in the [LSP documentation for textDocument/diagnostic](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#documentDiagnosticParams), specifically: - previousResultId - identifier Solution: When requesting diagnostics, Neovim should include the `previousResultId` and `identifier` parameters as part of the request. These parameters enable the server to utilize caching and return incremental results. Support for maintaining state is already present in the [textDocument/semanticTokens implementation](https://github.com/neovim/neovim/blob/8f84167c30692555d3332565605e8a625aebc43c/runtime/lua/vim/lsp/semantic_tokens.lua#L289). A similar mechanism can be implemented in `textDocument/diagnostic` handler.