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Problem: unnecessary and deprecated diagnostics use their own highlight groups (`DiagnosticUnnecessary` and `DiagnosticDeprecated`) which override the typical severity-based highlight groups (like `DiagnosticUnderlineWarn`). This can be misleading, since diagnostics about unused variables which are warnings or errors, are shown like comments, since then only the `DiagnosticUnnecessary` highlight group is used. Users do not see the more eye-catching red/yellow highlight. Solution: Instead of overriding the highlight group to `DiagnosticUnnecessary` or `DiagnosticDeprecated`, set them in addition to the normal severity-based highlights.