When squarify gave a group a sliver narrower than 2px, treemap passed cells a zero or negative width, so the row count became complex or divided by zero and render crashed. cells now returns no cells for rectangles without area. A regression test renders a 300 and 1 item split.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9UU71SP1UKGR51Sowbgmq
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