Umut CANandClaude Opus 5
54bbf72312
`_paper_frame` computed `paper_per_unit = mm_per_unit * unit` where `unit` is millimetres per paper unit, so an extents+fit plot on an inch sheet reported `effective_scale: "607.06:1"` for a fit that is `1:1.06276` (off by 25.4 squared). The render was right (`units_per_mm` is unit-free); only the label was wrong, and it flowed into `drawing_export_pdf(layout=...)`. The mm sheet could not see it because there `unit` is 1. `test_extents_plot_fits_the_printable_area_and_centres` is parametrized over ISO A3 (mm, width-bound) and ANSI B (inches, height-bound); the ink position is derived from the centred frame so both cases check the same invariant. The inch case fails without the fix. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd