John Beard 3bd3b8073e SVG import: avoid duplicating points in line chains
Every new section duplicated the start/end points.

This saves half the points when importing. They're skipped later
before they end up as real items, but it's confusing to trace
through (and theoretically inefficent, but it'll be tiny).
2025-01-01 01:14:41 +08:00
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