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Uladzimir KarpenkaandClaude Opus 4.8
655d242d02
Mirror the existing Wideband gradient fill option for the main spectrum: a "Spectrum gradient fill" checkbox on the Display settings tab gates the under-curve gradient in TSpectrumView.DrawSpectrum. The curve, grid, filter band and VFO markers always draw; only the gradient is optional. Persisted as spectrum_fill in settings JSON (default True, preserving current appearance). Wired through Settings -> SettingsForm visibility event -> MainForm -> TSpectrumView.FillSpectrum, same path as WidebandFill. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>