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#3692: progress log and layout parity note for linear-time lookups

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Findings 1, 3, 5, 13, 23, 28, 29 and 30 (#3706): one Progress log row, one Performance row in layout-parity.md, revision-history rows.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Martin Ball
2026-10-26 00:19:16 +00:00
co-authored by Claude Opus 5.5
parent ee96c4c99d
commit 0674573b45
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@@ -196,6 +196,7 @@ No overall parity estimate changes from these probes.
| Scrolling a 1,096-page document that is one 5,300-row table (#811) | ~2.4 ms idle, ~4.5 ms median scroll frame (was ~600 ms); opening still lays out for ~4–8 s | not measured | measured 2026-10-12, release, headless (`tests_perf::big_table_scroll_bench`) |
| A word with no break opportunity in it, laid out beside a floating object (#3412) | 1 MiB: 29.4 s → 0.35 s; 4 MiB: 472 s → 1.4 s | not measured | measured 2026-10-21, on 9b4b948c before the fix and with it (`layout::tests::a_long_unbreakable_word_lays_out_in_linear_time`, `layout::tests::a_megabyte_long_word_lays_out_quickly`) |
| The same word, with a font that pulls half its glyphs back so that its advances alternate in sign (#3412) | 8× the word costs 52× the time before the fix, 15× with it | not measured | measured 2026-10-22, release, on `00bc6a4b` before the fix and with it (`layout::tests::a_word_with_alternating_advances_lays_out_in_linear_time`) |
| Pages, sections and paragraphs with thousands of clipped cells, tracked authors, comment authors, sections, header paragraphs, spanning cells, hidden bidi offsets or math characters (#3692, #3706) | linear: each lookup is indexed or walked once (was a rescan per item) | not measured | `layout::tests_linear`, `math::tests::a_long_text_run_lays_out_in_linear_time` |
A word with no break opportunity in it takes a line per few characters, and measuring the word
beside a floating object walked the whole paragraph for every one of those lines, so the layout
@@ -271,6 +272,7 @@ layout suite are pending; this is not a new Word/native-IME acceptance claim.
| 2026-10-24 | trivial | Floating tables count exact line-bottom contact; shapes keep strict overlap (#3977); original boundary/skip regressions in modes 11/12/14/15, expected Word rule from cyril265; readiness estimates unchanged |
| 2026-10-23 | trivial | cu20we: preserve and render outline caps across DOCX/VML, screen and PDF; synthetic regressions; readiness estimates unchanged |
| 2026-10-23 | trivial | cu20we: paragraph-relative box floats use the pre-spacing origin; header/footer/cell/text-box regressions; readiness estimates unchanged |
| 2026-10-22 | trivial | Layout lookups linear in clipped cells, authors, sections, header paragraphs and bidi offsets (#3692, #3706) |
| 2026-10-22 | trivial | Group connector rerouting preserves displayed free and unresolved endpoints under nonuniform scaling while resolved ends keep their connection-site path; degenerate dimensions and unrepresentable fallback display spans are guarded; synthetic model/engine coverage only, readiness estimates unchanged |
| 2026-10-21 | trivial | A word with no break opportunity in it, laid out beside a floating object, no longer lays out quadratically: every word is measured once, before the line is broken (#3412) |
| 2026-10-23 | trivial | An empty paragraph whose mark is hidden is laid out as nothing, like a deleted one: no room, no list number (still counted, as in Word) and no shading, in the body and in table cells, headers and text boxes (#3982) |