vnc: fix blue channel shift using red_max instead of blue_max in convert_pixels#3395

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copilot/fix-vnc-color-output

Commits on Apr 28, 2026

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Commits on Apr 29, 2026

Fix shift_b calculation in convert_pixels to use blue_max instead of red_max

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benhillis
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Add tests for convert_pixels to prevent regression

Copilot
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benhillis
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