fix(#2990): Do not check if buffer is buflisted in diagnostics.update() #2998
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This ensures that LSP diagnostics of files which are not manually opened by users are rendered by nvim-tree diagnostic indicators.
However when users attach an LSP to nvim-tree this will bring back flashing as attempted to fix in #2980. Fixing this should probably done by checking data passed via diagnostic events (DiagnosticChanged and CocDiagnosticChanged).