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Each patch of a gradient mesh was cut into 8 x 8 flat quads for SVG export, Object > Expand and the other outputs that cannot shade a mesh, whatever its colours, so a patch of one colour became 64 identical pieces. Neighbouring quads are now joined into square blocks wherever the colour changes by no more than about one 8-bit step across the block; the block's outline runs through its quads' corners, and a patch that folds over itself is not joined.