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};",151,156,113,[955,956,957,958,959,960,961,962,963,964,965,966,967,968,969,970,971,972,973,974,975,976,977,978,979,980,981,982,983,984,985,986,987,988,989,990,991,992,993,994,995,996,997,998,999,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1041,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1055,1056,1057,1058,1059,1060,1061,1062,1063,1064,1065,1066,1067],{"_77":78,"_79":1149},{"_77":78,"_79":268},{"_77":78,"_79":82},{"_77":53,"_79":1108},{"_77":53,"_79":1148},{"_77":53,"_79":1147},{"_77":53,"_79":1104},{"_77":53,"_79":1146},{"_77":53,"_79":82},{"_77":53,"_79":1145},{"_77":53,"_79":1144},{"_77":53,"_79":82},{"_77":53,"_79":1143},{"_77":53,"_79":1142},{"_77":53,"_79":1141},{"_77":53,"_79":1140},{"_77":53,"_79":1139},{"_77":53,"_79":82},{"_77":53,"_79":1108},{"_77":53,"_79":1138},{"_77":53,"_79":1137},{"_77":53,"_79":1104},{"_77":53,"_79":1136},{"_77":53,"_79":1135},{"_77":53,"_79":1134},{"_77":53,"_79":1133},{"_77":53,"_79":1132},{"_77":53,"_79":1131},{"_77":53,"_79":1130},{"_77":53,"_79":1129},{"_77":53,"_79":1128},{"_77":53,"_79":737},{"_77":53,"_79":1127},{"_77":53,"_79":1126},{"_77":53,"_79":752},{"_77":53,"_79":1125},{"_77":53,"_79":1124},{"_77":53,"_79":1123},{"_77":53,"_79":1122},{"_77":53,"_79":1121},{"_77":53,"_79":737},{"_77":53,"_79":1120},{"_77":53,"_79":1119},{"_77":53,"_79":1118},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1117},{"_77":53,"_79":1116},{"_77":53,"_79":1115},{"_77":53,"_79":1114},{"_77":53,"_79":1113},{"_77":53,"_79":1112},{"_77":53,"_79":1111},{"_77":53,"_79":1110},{"_77":53,"_79":740},{"_77":53,"_79":737},{"_77":53,"_79":1109},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1108},{"_77":53,"_79":1107},{"_77":53,"_79":1106},{"_77":53,"_79":1105},{"_77":53,"_79":1104},{"_77":53,"_79":1103},{"_77":53,"_79":1102},{"_77":53,"_79":1101},{"_77":53,"_79":1100},{"_77":53,"_79":82},{"_77":53,"_79":1099},{"_77":53,"_79":1098},{"_77":53,"_79":1097},{"_77":53,"_79":1096},{"_77":53,"_79":1095},{"_77":53,"_79":1094},{"_77":53,"_79":742},{"_77":53,"_79":740},{"_77":53,"_79":1093},{"_77":53,"_79":1092},{"_77":53,"_79":1091},{"_77":53,"_79":740},{"_77":53,"_79":1090},{"_77":53,"_79":1089},{"_77":53,"_79":1088},{"_77":53,"_79":1087},{"_77":53,"_79":1086},{"_77":53,"_79":273},{"_77":53,"_79":1085},{"_77":53,"_79":1084},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1083},{"_77":53,"_79":1082},{"_77":53,"_79":1081},{"_77":53,"_79":1080},{"_77":53,"_79":1079},{"_77":53,"_79":1078},{"_77":53,"_79":1077},{"_77":53,"_79":1076},{"_77":53,"_79":1075},{"_77":53,"_79":737},{"_77":53,"_79":1074},{"_77":53,"_79":736},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1073},{"_77":53,"_79":1072},{"_77":53,"_79":1071},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":78,"_79":1070},{"_77":78,"_79":1069},{"_77":78,"_79":1068},"\tlines: Line[],","function measureLines(","/** Measure height and widest line across `lines` in a single Pretext walk. */","\treturn ;","function Wrap() {","/** A line break that is drawn but never copied, so selected text keeps its original spacing. */","\tif (last < text.length) out.push(text.slice(last));","\t\tlast = at;","\t\tout.push();","\t\tif (at > last) out.push(text.slice(last, at));","\tfor (let at of offsets) {","\tlet last = 0;","\tlet out: ReactNode[] = [];","\tif (!offsets) return text;","function wrapText(text: string, offsets: number[] | undefined, key: string): ReactNode {","/** Split `text` at wrap offsets, joining the pieces with forced line breaks. */","\treturn wraps;","\twrapCache.set(line, { width, wraps });","\t\telse wraps.breaks.set(itemIndex, [at]);","\t\tif (list) list.push(at);","\t\tlet list = wraps.breaks.get(itemIndex);","\t\tlet at = sourceOffset(line.items[itemIndex]!, start);","\t\tlet { itemIndex, start } = range.fragments[0]!;","\t\t\treturn;","\t\t\tfirst = false;","\t\tif (first) {","\t\t\t\tif (fragment.occupiedWidth > width) wraps.wide.add(fragment.itemIndex);","\t\t\tfor (let fragment of range.fragments) {","\t\tif (range.width > width) {","\twalkRichInlineLineRanges(line.prepared, width, range => {","\tlet first = true;","\tlet wraps: Wraps = { breaks: new Map(), wide: new Set() };","\tif (hit?.width === width) return hit.wraps;","\tlet hit = wrapCache.get(line);","\tif (!line.prepared) return NO_WRAPS;","function wrapsAt(line: Line, width: number): Wraps {"," */"," * Pretext's, so rendering forces Pretext's breaks instead of letting the browser choose its own."," * with Pretext at some boundaries (`body/meta`, link text, subpixel drift), and the block height is"," * Where Pretext wraps `line` at `width`. The browser's own line breaker and text shaping disagree","/**","\treturn offsets[target]!;","\t\t\ttarget += segment.length;","\t\t\tif (n++ === cursor.graphemeIndex) break;","\t\tfor (let { segment } of graphemes.segment(segments[cursor.segmentIndex]!)) {","\t\tlet n = 0;","\tif (cursor.graphemeIndex > 0) {","\tlet target = starts[cursor.segmentIndex]!;","\tlet { segments, starts, offsets } = source(item);","function sourceOffset(item: RichInlineItem, cursor: LayoutCursor): number {","\treturn value;","\tsourceCache.set(item, value);","\tlet value = { segments, starts, offsets };","\t\telse while (at < text.length && COLLAPSIBLE.test(text[at]!)) at++;","\t\tif (!COLLAPSIBLE.test(text[at] || \"\")) at++;","\t\toffsets.push(at);","\tfor (let n = 0; n <= length; n++) {","\twhile (at < text.length && COLLAPSIBLE.test(text[at]!)) at++;","\tlet offsets: number[] = [];","\tlet text = item.text;","\t\tlength += segment.length;","\t\tstarts.push(length);","\tfor (let segment of segments) {","\tlet length = 0;","\tlet starts: number[] = [];","\tlet { segments } = prepareWithSegments(item.text, item.font);","\tif (hit) return hit;","\tlet hit = sourceCache.get(item);","function source(item: RichInlineItem): Source {"," * segment for segment; map that text back onto the source once per item."," * Pretext lays out each item's whitespace-collapsed text, which `prepareWithSegments` reproduces","let graphemes = new Intl.Segmenter(undefined, { granularity: \"grapheme\" });","let sourceCache = new WeakMap();","let wrapCache = new WeakMap();","const COLLAPSIBLE = /[ \\t\\n\\f\\r]/;","const NO_WRAPS: Wraps = { breaks: new Map(), wide: new Set() };","type Source = { segments: string[]; starts: number[]; offsets: number[] };","/** An item's Pretext segments, where each starts, and the source offset of each laid-out char. */","type Wraps = { breaks: Map; wide: Set };"," * unbreakable nodes wider than the line."," * Source offsets, keyed by inline node index, where Pretext starts each wrapped line, and the","\treturn index >= track.edge;",10,[1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162],{"_77":78,"_79":1170},{"_77":55,"_79":1169},{"_77":53,"_79":1168},{"_77":53,"_79":304},{"_77":53,"_79":1167},{"_77":53,"_79":1166},{"_77":53,"_79":1165},{"_77":53,"_79":1164},{"_77":78,"_79":82},{"_77":78,"_79":1163},{"_77":78,"_79":82},"import type { Block } from \"../../lib/block\";","} from \"@chenglou/pretext/rich-inline\";","\twalkRichInlineLineRanges,","\ttype RichInlineItem,","\tmeasureRichInlineStats,","import { type LayoutCursor, prepareWithSegments } from \"@chenglou/pretext\";","import { measureRichInlineStats } from \"@chenglou/pretext/rich-inline\";","import { type CSSProperties, Fragment, type ReactNode, useEffect, useRef, useState } from \"react\";","b2f41f5","ab94af6","packages/ui/src/components/blocks/blocks.css",{"_89":1263,"_91":92},{"_89":1262,"_91":92},46,[1178],{"_59":1179,"_61":98,"_63":1179,"_64":1180,"_66":1181},246,49,[1182,1183,1184,1185,1186,1187,1188,1189,1190,1191,1192,1193,1194,1195,1196,1197,1198,1199,1200,1201,1202,1203,1204,1205,1206,1207,1208,1209,1210,1211,1212,1213,1214,1215,1216,1217,1218,1219,1220,1221,1222,1223,1224,1225,1226,1227,1228,1229,1230],{"_77":78,"_79":1261},{"_77":78,"_79":737},{"_77":78,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1260},{"_77":53,"_79":1259},{"_77":53,"_79":1258},{"_77":53,"_79":1257},{"_77":53,"_79":1256},{"_77":53,"_79":1255},{"_77":53,"_79":737},{"_77":53,"_79":82},{"_77":53,"_79":1254},{"_77":53,"_79":1253},{"_77":53,"_79":737},{"_77":53,"_79":82},{"_77":53,"_79":1252},{"_77":53,"_79":1251},{"_77":53,"_79":1250},{"_77":53,"_79":1249},{"_77":53,"_79":1242},{"_77":53,"_79":737},{"_77":53,"_79":82},{"_77":53,"_79":1248},{"_77":53,"_79":1247},{"_77":53,"_79":1246},{"_77":53,"_79":737},{"_77":53,"_79":82},{"_77":53,"_79":1245},{"_77":53,"_79":1244},{"_77":53,"_79":1243},{"_77":53,"_79":1242},{"_77":53,"_79":737},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1241},{"_77":53,"_79":1240},{"_77":53,"_79":1239},{"_77":53,"_79":1238},{"_77":53,"_79":268},{"_77":53,"_79":82},{"_77":53,"_79":1237},{"_77":53,"_79":1236},{"_77":53,"_79":1235},{"_77":53,"_79":1234},{"_77":53,"_79":1233},{"_77":53,"_79":1232},{"_77":53,"_79":1231},{"_77":53,"_79":268},"\tvertical-align: top;","\toverflow: hidden;","\tmax-inline-size: 100%;","\tdisplay: inline-block;",".line-clip {"," lines followed Pretext's breaks. */","/* An unbreakable token wider than its line stays clipped to the block's measured width, as before","\twhite-space: pre;","\tcontent: \"\\A\";",".line-wrap::before {","/* A forced line break drawn as generated content, so copied text has no extra newline. */","\t\ttranslate: 0 -1px;","\t\tfont-size: 12px; /* DOCUMENT_FONT */","\t\tpadding: 1px 6px; /* DOCUMENT_PAD_X */","\t.document-reference {","\t\tblock-size: 14px;","\t\tinline-size: 14px; /* MENTION_AVATAR */","\t.mention-avatar {","\t\tfont-size: 12px; /* MENTION_FONT */","\t\tpadding: 1px 6px 1px 1px; /* MENTION_PAD_START, MENTION_PAD_END */","\t\tgap: 3px; /* MENTION_GAP */","\t.mention {","\t\tpadding-inline-start: 8px; /* QUOTE_INDENT */","\tblockquote {","\t\tpadding-inline-start: 20px; /* LIST_INDENT */","\tol {","\tul,",".content.measured {"," line width stay in px instead of following the root font size like the composer's. */","/* Text blocks are measured in fixed pixels (parse.ts, constants.ts), so their sizes that affect","\t\tanimation: none;","25c94d9","c39498c","id","01M49YD2BGCP450TANYBT08FF0","project","number",175,"title","fix(ui): render timeline text with the line breaks it was measured with","description",{"_1305":1306,"_52":1307},"state","merged","base",{"_1266":18,"_1300":1303,"_1302":1304},"head",{"_1266":18,"_1300":1301,"_1302":38},"mergeRevision","ad3f7313ea18f2fd9c5f9e3fb2ca9c5b1df67861","implements",[],"addresses",[1299],"createdBy",{"_1295":1296},"createdAt","2026-10-07T01:07:18.000Z","updatedAt","2026-10-07T11:11:12.000Z","locked","fork","headAvailable",true,"actor",{"_51":1297,"_1264":1298},"user","import:github:1714999","01M49PR8C06D2Y2JFHM5HZPAVJ","branch","refs/pull/175/head","revision","refs/heads/main","39191bb63434716c5162010baaae4b247ea370a1","format","markdown","Closes #168. Long timeline messages could hide their last line. Pretext measured each text block's height, but the browser wrapped the HTML on its own, inside a box that `overflow: hidden` clipped to that height.\n\n**Cause** (reproduced in a real browser with the exact message from the issue: at a 706px bubble it ends `…save your` and `manifest.` is clipped)\n- **Break rules differ.** Pretext breaks after `/` in `body/meta` and `#23/#34`. Chromium doesn't break there.\n- **Widths drift.** The DOM line came out about 1px wider than Pretext's 334.86px at a 335px fit. The bubble shrink-wraps to Pretext's widest line, so any drift moves a word down a line.\n- **Font loading.** Text measured before Inter Variable loaded kept fallback-font widths in Pretext's caches. On a cold load, 700 of 741 widths clipped.\n- **Root font size.** Mention, document chip, list and quote sizes and the lane width were in rem, but the layout math is fixed px. At 12px and 20px roots, lines overflowed or clipped.\n\n**Fix**\n- Text blocks render at Pretext's own breaks (`wrapsAt` in `blocks/text.tsx`), for both settled and streaming text. Each block is `white-space: nowrap`, and each wrap is a `::before` line break, so copied text keeps its original spacing. Rich-inline cursors map back to source offsets through per-item tables from `prepareWithSegments`, so collapsed whitespace, soft hyphens and surrogate pairs land on the right offsets. Each `Line` caches only its latest width.\n- Overflow stays clipped vertically. Horizontally it is visible, so sub-pixel drift paints into the bubble padding instead of cutting glyphs.\n- An unbreakable token wider than its line stays clipped to the measured width, the same bounded behavior as before. A user bubble no longer grows wider than the lane for such a token. Revealing the clipped text is #174.\n- `timeline/layout.ts` clears Pretext's caches and the parse and measurement caches when web fonts finish loading. Mounted timelines then reparse. A parse that was already running when fonts changed isn't cached, and `document.fonts.ready` is checked again after subscribing.\n- Geometry now uses the same units as the layout math:\n - Chips, list indent and quote indent in measured text blocks use the px constants. The `.content.measured` scope leaves the rich-text composer's sizes alone.\n - `--main-content-max` is `832px`, matching `LANE`.\n - The avatar gap uses `AVATAR_GAP`.\n\n**Validation** at head `9570146`, rebased on `10f06d2`. It merges cleanly with current main.\n- `bun types` and `bun run ci` passed.\n- React Doctor on the changed files reported no diagnostics. Its project score is 63/100.\n- **Headless browser harness.** This is real Chromium running the real `Timeline` and app `toEvents`, with the backed-up message from issue-triage entry 200 plus assistant, rich (mention, link, inline code, multi-line), list and quote messages. It checks every width from 360 to 1100px (741 widths). A width fails on any vertical overflow, a hidden last character, a row taller than its virtual height, paint past the bubble or viewport, or copied text that doesn't match.\n - **Before**, with fonts preloaded: 71 widths failed at a 16px root, 472 at 12px and 561 at 20px. On a cold font load, 700 failed.\n - **After**: 0 widths failed at 16px, 12px and 20px roots and on a cold font load. 0 widths failed on the streaming render path with a fixed draft, which doesn't exercise incremental chunks or the settle transition; the real provider exchange below streamed for real. Text painted at most 0.8px into the padding.\n - A 1,050px inline code token is clipped inside its bubble both before and after.\n- **Native.** A signed Ace-dev build of this head ran with a real Anthropic `claude-opus-5-5` exchange: the long human message with a mention and the same `/` tokens, a rich reply and a list. After a relaunch, an Ace agent used native desktop tools to capture the window at 1100px wide. Both bubbles end with `save your manifest.` fully visible, with no clipped glyphs.\n - Narrow native widths are **unverified**: at 760px and 640px the details panel covered the chat. The browser sweep covers narrow widths.\n\n### Built in Ace\n\nThe code, checks, commits and native runs were made in an Ace channel, except for:\n- **Codex.** Codex coordinated and did read-only review outside Ace (#9).\n- **Headless Chrome.** The browser harness ran in headless Chrome with a temporary profile, launched from the shell, and reported DOM measurements to a local Vite server. Ace's browser tools can't read DOM measurements or drive input (#50).\n- **Issue screenshot.** The private screenshot from #168 couldn't be read with Ace's tools (#51).\n- **Native desktop tools.** The channel's own source worker couldn't use them (#128), so a separate agent channel on the Ace-dev host ran the native checks.\n- **Native run issues.** These weren't investigated further:\n - Ace-dev exited once without explanation, with code 0.\n - After the host restarted, an interrupted agent run resumed and controlled the same window as the second agent.\n - Point clicks and scrolls were refused or had no effect, and the app's message text isn't in the accessibility tree (#8).\n - `desktop_activate` timed out with an unknown result 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