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fix(task-25): page_setup_truth and settings_pdf_mediabox_a3 move the sheet to ANSI B before proving A3

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A fresh Layout1 is already ISO A3 landscape (ezdxf R2018 default: 420 x 297,
plot_rotation 0), so an A3-only /MediaBox read-back passed with
page_setup_apply stubbed to a no-op: the A/B gate row and the v4 matrix task
could not fail on the setter. Both now apply ANSI B (432 x 279, a size no
fresh document has; spec section 9 names it) and read that PDF first, then
apply ISO A3, read its PDF, and require the setter's changed.size_mm to have
moved from B to A3. The stub fails at the first PDF.

The moved-sheet comparison is +/-0.5 mm, the spec's tolerance, not exact:
measured live on AutoCAD 2026 (scratch Documents.Add(), closed unsaved), the
COM engine reports ANSI B as 431.8 x 279.4 and the DWG To PDF.pc3 file's
MediaBox as 431.8 x 279.4 then 420.158 x 297.039 for A3; the task passes
there with changed.size_mm [[431.8, 279.4], [420.0, 297.0]]. Headless it is
[[432.0, 279.0], [420.0, 297.0]].

tests/test_benchmark_v4.py gains the mutation test the finding describes
(setter stubbed -> both rows must fail; both passed on the old code) and a
run of the gate row itself; the headless task test asserts the B stage.
README rows and the tasks_v4 docstring say what the task now does; the README
collected-tests figure follows the two new tests (3282 -> 3284). The
regenerated A/B report against v1.5.1 is byte-identical (26 -> 32/32).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
This commit is contained in:
Umut CAN
2026-09-22 13:27:17 +03:00
co-authored by Claude Opus 5
parent c2942d3c94
commit 18c7c69da6
6 changed files with 134 additions and 14 deletions
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benchmarks/tasks_v4.py
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@@ -7,7 +7,9 @@ and the instrument index are each derived independently of the drawing code.
``page_setup_truth`` (track E) applies an ISO A3 landscape page setup to a
layout, plots it through ``batch_plot`` and reads the sheet size back from
the PDF's own ``/MediaBox`` — the setup is verified by the file, not by the
setter's return value.
setter's return value. A fresh Layout1 is already A3 landscape, so the task
moves the sheet to ANSI B (432 × 279) and reads that PDF first; a setter that
writes nothing fails there, not at the A3 read-back.
The published competitor reports were never asked either question; the chart
shows ``not_run`` for them, not zero.