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* Viewer: touchpad scrolling tracks the finger 1:1 (#759) A precision touchpad sends pixel-precise `MouseWheel` events. On Windows they arrive with no `TouchPhase::Start`, so egui never takes its no-smoothing "in touch" path and eases any delta of 8 px or more over several frames, leaving the page a frame behind the finger. The page view now applies precise (Point-unit) wheel input itself, 1:1, through the same un-eased scroll path as keyboard and middle-button auto-scroll, and suppresses egui's eased copy for a short window so its internal easing tail neither doubles nor trails the motion. A coarse mouse wheel (Line/Page units) keeps egui's smoothing, which is pleasant for chunky notches, and single-page paging still owns the vertical axis. Regression test: one 200 px precise swipe scrolls the full 200 px at once (an eased path would ramp there over ~0.1 s) and leaves no drift. Co-Authored-By: Claude Opus 4.8 <[email protected]> * Viewer: Continuous scrolling is an independent checkbox over the base layout (#752) Page display matches Acrobat: the base layout (Single page or Two-page view) is a radio choice, and Continuous scrolling is a separate checkbox, so every combination is reachable. This also adds the previously missing "Two-page view, one spread at a time" mode. `PageLayout` now has just `Single` and `TwoUp`; a separate `continuous` flag on the view (and on the default view preferences) decides whether it scrolls. A single `display_token` ("single" | "continuous" | "two-up" | "two-page") serialises both for settings and the control channel, keeping the earlier `continuous`/`single`/`two-up` names working and adding `two-page` for the new mode. The PDF's own page-layout request now maps to the right (layout, continuous) pair, including plain TwoUp. - View ▸ Page display and the rail menu show two radios plus a Continuous scrolling checkbox; Preferences gains a default Continuous checkbox. - `view.continuous` toggles the checkbox; `view.layout.single` / `view.layout.two_up` switch the base layout without touching it. The former `view.layout.continuous` command is gone (its state is Single + continuous); the `layout`/`default-layout` options and a new `continuous` option cover scripting. - Not scrolling, the wheel and the arrow/Page keys turn whole spreads in Two-page view, and only the current page or spread is laid out. Tests: new `notches_turn_two_page_spreads`, `two_page_view_shows_one_spread_at_a_time_until_continuous`, and updated layout/command/persistence tests; the `view()` helper takes `continuous`. Co-Authored-By: Claude Opus 4.8 <[email protected]> * Parity: the continuous-scrolling feature points at view.continuous --------- Co-authored-by: Justin John <[email protected]> Co-authored-by: Claude Opus 4.8 <[email protected]> Co-authored-by: Brandon Thomas <[email protected]>