Type: Standard Vertical Roman Alignment stands half-width characters upright in vertical type

Character panel menu > Standard Vertical Roman Alignment, with Show East
Asian Options, is now a check item. It sets a new character attribute,
`standardVerticalRoman` (text.setFormat, text.setRangeStyle), off by
default and saved only when on. In vertical type the marked Latin
letters, digits and other characters that would lie on their side stand
upright one below the other, each in its upright cell. Spaces keep their
width and tate-chu-yoko blocks stay across the column. Horizontal type
keeps the mark and does not change. A combining mark shaped as its own
glyph turns with its letter, in Latin and CJK upright type alike.

Character Style Options labels the Character Alignment row "Character
Alignment" and gives Standard Vertical Roman Alignment its own checkbox.
Reset Panel turns the attribute off. PDF and SVG export place the glyphs
from the layout and need no change.

crates/engine/src/cmd/textstyles.rs

@@ -175,6 +175,7 @@ pub fn char_attrs(v: &CharStyle) -> Map<String, Value> {
         ("charDirection", json!(v.char_direction)),
         ("proportionalMetrics", json!(v.proportional_metrics)),
         ("tateChuYoko", json!(v.tate_chu_yoko)),
+        ("standardVerticalRoman", json!(v.standard_vertical_roman)),
         ("noBreak", json!(v.no_break)),
         ("digits", json!(v.digits)),
         ("language", json!(v.language)),