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From the review of #5228. The finished CMYK group was drawn through whatever paint transform a preceding shading pattern left on the context, so its cyan half showed magenta. Hayro patch (27) now resets the paint transform before drawing the group's pixels. Two regression tests, both reported in that review: - a pattern painted before the group (fails without the reset); - the Color blend mode over an empty CMYK group, swept over all 256 K levels (failed on nine levels before #5199's vello_cpu fix was merged in; passes with it). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9