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dxf_ext::is_paper_view (#225) matched any 1000 string in the CADCraft xdata, but later strings are layer names (VPFROZEN, VPCOLORS). A real viewport with a frozen or recoloured layer named PAPERVIEW was therefore dropped on read. Only the first string, where the writer puts the marker, counts now. Regression test in tests/paperview_marker.rs. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>