`_csiHandleSgr` carried a `// ignore: dead_code` directive with the
note "workaround for a bug in the analyzer". Re-running the
analyzer with the suppression removed produces no warning — Dart's
flow analysis has caught up since the comment was added.
Per the no-lint-suppression rule the suppression needed to be
either removed or given a more substantive justification; the
analyzer's silence makes the call easy.
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude
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