Type: Optical Margin Alignment hangs punctuation in right-to-left paragraphs

Optical Margin Alignment and Roman Hanging Punctuation left every
right-to-left paragraph of point and area type, and type on a path
whose first paragraph runs right to left, as it was: the quotation
marks, full stops and commas at the ends of its lines stayed inside
the margins.

A right-to-left line now hangs at the margins its alignment places it
against, as a left-to-right line does. Auto aligns a right-to-left
line at its right, so it hangs there. The line is read from right to
left: where it hangs at its left margin, a full stop and the quotation
mark after it that end the line hang together. In vertical type,
where the characters of a right-to-left paragraph run from the top
down, the pair is read from the top.

Type on a path whose first paragraph runs right to left hangs at its
brackets by the same rule. In horizontal type, Auto places it at the
end bracket, so it hangs there. On a closed path, its hang at the end
bracket gets the space between the end and start brackets before its
hang at the start bracket does, as in right-aligned type.

A justified right-to-left line of one word is spread between its
letters as they are drawn. The gap after each letter went to the
letter that follows it in the text, so the two leftmost letters
touched and the word ended one gap short of the right margin.

Docs: docs/mcp.md, docs/type-parity.md, docs/target-app-parity.md.

docs/type-parity.md

@@ -35,7 +35,7 @@ against Illustrator's public documentation; **estimated** unless noted.
 | Fallback glyphs keep the text's weight and slant | done | #2491: a character from a fallback face is set in that family's face nearest the run's weight and slant; Bold Italic of a missing family is drawn Bold (Source Sans 3 has no Bold Italic) rather than Italic |
 | Colour fonts (OpenType SVG / COLR) | partial | |
 | Every-line and Single-line composers | done | tuned by eye, never compared side by side |
-| Optical Margin Alignment | done | Type › Optical Margin Alignment, `type.opticalMarginAlignment`: per type object, with one setting for all the frames of a thread, in point and area type of left-to-right paragraphs, and at the brackets of type on a path whose first paragraph runs left to right; right-to-left paragraphs of point and area type, and type on a path whose first paragraph runs right to left, do not hang |
+| Optical Margin Alignment | done | Type › Optical Margin Alignment, `type.opticalMarginAlignment`: per type object, with one setting for all the frames of a thread, in point and area type of left-to-right and right-to-left paragraphs, and at the brackets of type on a path |
 | Roman Hanging Punctuation | done | Paragraph panel menu › Roman Hanging Punctuation, `text.setFormat {romanHangingPunctuation}` (#2756): per paragraph, Optical Margin Alignment's punctuation and amounts without the letters; paragraph styles carry it. Evidence: `tests::roman_hanging_punctuation_hangs_punctuation_but_not_letters`, `typecmd::area_tests::roman_hanging_punctuation_is_set_per_paragraph_and_saved_only_when_on` |
 | Hyphenation… and Justification… options | done | Hyphenation… (`ui.hyphenation`, `text.setFormat`) sets each paragraph's Words Longer Than, After First, Before Last, Hyphen Limit, Hyphenation Zone (Single-line Composer only) and Hyphenate Capitalized Words, and paragraph styles carry them (#2310). Justification… (`ui.justification`, `text.setFormat`, #2755) sets Word Spacing, Letter Spacing and Glyph Scaling (Minimum, Desired, Maximum), Auto Leading and Single Word Justification; Desired applies to every line, justified lines and the Every-line Composer use the ranges. Vertical type isn't glyph scaled; type on a path doesn't use them. Evidence: `crates/text/src/tests_justify.rs`, `dialogs::justification::tests` |
 | Tab stops and leaders; Tabs panel | partial | Tabs panel and stops with leaders in the model (`text.tabs.set`); a stop drags from where the press landed (#1458); leaders fill the tab's gap, repeated on a grid so they line up from line to line (#1877) |