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imachusandClaude Opus 5.5
46dc8b1bde
Japanese layout measures leading from the top of one line's ideographic em box to the next (the right side, in vertical type), not from baseline to baseline. The Paragraph panel menu now offers both: - `ParaStyle.leading_model`: RomanBaseline (as before, the default) or EmBoxTop. With EmBoxTop a line's leading is the space below it — the next line's em box top is this line's plus its leading, and the next baseline hangs from there by that line's tallest em box — and area type's first line touches the top of the frame (its em box top on the frame's top, at least Area Type Options' minimum). With baseline leading a line's leading stays the space above it. - Lines of one size are exactly as far apart either way; the models differ for mixed sizes and for the first line of area type (fonts whose ascent isn't the em box top: Hiragino's nearly is). - The em box top comes from the font's vertical metrics (#343), else 0.88 em. Written only when EmBoxTop. - `text.setFormat {leadingModel: "romanBaseline"|"emBoxTop"}`; menu items Top-to-Top Leading / Bottom-to-Bottom Leading (checked as set); catalog rows in ja and zh-hant. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>