Illustrator's Every-line Composer balances the breaks of the whole
paragraph for left/centre/right aligned text too, not only justified
text. VectorCraft only composed justified area text; ragged text was
always broken greedily.
- Model: ParaStyle.composer (vectorcraft_doc::Composer, re-exported by
vectorcraft-text), Every-line by default like Illustrator, saved only
when Single-line. layout() reads it from the object;
LayoutOptions.composer is now an Option override for tests.
- Composer: the justified gate is gone. Ragged lines never shrink (a
line that doesn't fit ends the node), badness is 100*r^3 with r = the
line's leftover space over a rag zone of 1/6 of the width (finite for
lines without spaces); the last line is free unless shorter than 1/3
of the width (measured in zones of 1/3), so a lone short word on the
last line pulls a word down. Hyphens cost 25 in ragged text (50 in
justified). Knuth-Plass fitness classes with adjacency demerits
(justified 10000, ragged 1000). Lines past the last width change
share one node key, active nodes are capped (4096) and paragraphs
over 200k glyphs break single-line, so work stays bounded; ragged
tries a tolerance of one rag zone, then any fitting breaks, then
falls back to greedy.
- text.setFormat {composer: "singleLine"|"everyLine"}; the Paragraph
panel menu's composer items work with a check mark (Reset Panel goes
back to Every-line).
- Tests: ragged Every-line moves "or" down in "Destroy all creatures
with toughness X or less." where greedy leaves "less." alone; the rag
of long paragraphs is no worse than greedy (sum of squared leftover
and of neighbour differences); Single-line is greedy; the 10k-char
layout budget covers ragged text; command test with undo; native
format round trip (rich_session's text is now Single-line).
No existing test needed changing: the justified tests and
hyphenated_layout_adds_hyphens (ragged, now Every-line) still pass.
Auto alignment (start of the paragraph direction) is ragged; a wrapped
line's Mojikumi flush opening bracket gives its half em back to the
composer, as in the line loop; tests cover Auto in both directions.
Layout of 10k chars, release: justified Every-line 5.6 ms, ragged
Every-line 5.8 ms, ragged Single-line 4.8 ms.
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