Mohamed Boudra
c689f8bb94
Both advance-measurement paths measured a line by re-measuring a growing prefix per grapheme, so one n-grapheme line shaped n^2/2 characters. The web canvas measurer and the model fallback each carried a copy, and the native Skia branch had the same shape via getRectsForRange(0, end) per grapheme. Nothing caps line length client-side, so one long generated line in a diff pinned the renderer main thread for minutes and the app read as frozen while compositor animations kept running. Advance measurement now has one owner in text-measurement.ts: 64-grapheme chunks measured against an accumulated base, with chunk boundaries snapped to shaping-safe seams so ligatures and contextual scripts keep their exact prefix-measured widths (the xfi/Arabic contract in model.test.ts is unchanged). A 1.2M-char line drops from a ~331-minute projection to under a second; measurement-cost.test.ts pins the linear shaped-character budget so the quadratic cannot come back.
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