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The narrow beacon decoder filter marker rendered differently in the two spectrum views: CPU drew a translucent filled band (BlendBand) plus a centre line, while OpenGL drew three plain vertical lines (both edges + centre), so it looked like one band on CPU and "two parts" on GL. Make the CPU path draw the same three lines as GL — consistent look and cheaper (drops the per-frame per-pixel alpha blend for this marker; BlendBand is kept for the RX/TX passband shading). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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