The Print dialog's Media list only had Letter/Legal/Tabloid and the ISO A
and B papers, so Japanese papers had to be entered as a custom size, and
"B4"/"B5" were ISO 216 (250 × 353 and 176 × 250 mm) although Japanese
printing uses the JIS sizes (257 × 364 and 182 × 257 mm, JIS X 6310).
Media gains JIS B4, B5 and B6 next to the ISO ones, and はがき
(japanese postcard, 100 × 148 mm), 往復はがき (japanese double postcard,
148 × 200 mm), 封筒 長形3号/長形4号 (japanese envelope #3/#4, 120 × 235
and 90 × 225 mm), 角形2号/角形3号 (kaku #2/#3, 240 × 332 and 216 × 277 mm),
四六判 (yonroku-ban, 127 × 188 mm) and A6, all in millimetres at 72/25.4.
b4 and b5 keep their ISO 216 dimensions so print settings and presets
saved before the Japanese papers existed keep their paper; the dialog
labels say "B4 (ISO)"/"B5 (ISO)" beside "B4 (JIS)"/"B5 (JIS)".
A paper is named by its JSON id or by its dialog label, any case and
spacing ("b5 (jis)", "B5 (JIS)" and "b5jis" all mean the JIS B5), so
agents and the control channel need not know the id spelling; an unknown
name is still refused. Media is written out instead of through the
choice! macro to carry that lookup.
The print.setup/file.print parameter docs and docs/mcp.md list the new
papers; the Print dialog picks them up from Choice::ALL with no UI code
change, and the Japanese labels are translated in ja.tsv (はがき,
往復はがき, 長形3号, 長形4号, 角形2号, 角形3号, 四六判).
Tests: japanese_paper_sizes checks every added size in points, that the
ISO B4/B5 values did not change, name resolution and id/label round
trips, and that each paper prints a PDF page with its own MediaBox size.
Validation: cargo fmt --all -- --check clean; cargo clippy
-p vectorcraft-pdf --all-targets -- -D warnings clean; cargo test
-p vectorcraft-pdf -> 330 passed, 0 failed (328 lib + 2 integration).
Midasdf