Preserve rustc diagnostics on textDocument/diagnostic request #1287
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As in rust-lang/rust-analyzer#18709, Rust Analyzer does not report cargo-produced diagnostics on
textDocument/diagnosticrequest. Due to the behavior, coc.nvim often resets diagnostics as described in #1276.Although I think it's Rust Analyzer that should be fixed, I temporary fix the problem by preserving
rustcdiagnostics on the request withprovideDiagnostic()middleware.Closes #1276.