A pattern fill in a pattern's tile art that paints a see-through or
colorized image was not counted, so PDF 1.3 export kept it as a
pattern and failed on its transparency. Detection now follows pattern
fills in tile art down to the three levels the canvas draws, skipping
hidden tile art, and the tiles the expansion makes are expanded again
for them. Expansion stops once the expanded art holds MAX_GENERATED
objects.
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