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fix(phone): one push/pop slide for every phone stack, built once and only moved; no flash of the previous pane (#1005, rebuild of #1006) #1014

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kayg wants to merge 0 commits from t3/pane-slide-c into dev

kayg commented

2026-11-08 03:07:25 +00:00

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Issue #1005. A rebuild of #1006 from dev (cd7f84432) as kayg decided in #1006's round-5 note: option (c), every phone screen is built once and only moved, by one CSS transition per screen on one attribute. #1006 is superseded by this and left open for kayg to close. Evidence for the 2× strips is in the comment below.

What it does

One owner of every position. styles/panes.css is the whole slide: a screen's translate and opacity are a CSS transition on its data-place (front, under, ahead, from lib/pane.ts placeOf), 280ms cubic-bezier(0.25, 0.8, 0.25, 1) with transition-delay: -16ms (the first frame already moves), visibility flipping with it, Reduce Motion crossfading. No script animation, no second transition, no unmounting for a slide, nothing built or changed under a finger. Notes (PhoneStack), Contacts and Tasks use it.
The glass tint is the stack's own still layer (.stack::before), the screens have no fill: the root cause of #1005's flash of the previous pane (a tinted screen drifting sideways showed its hard edge through the card above it).
Notes keeps the list and the note screen built (the list is never unmounted; the note's screen is built a little after the list is up, the first push builds what it needs where it is not yet reached and moves it a frame later). The card slides in as the note's title and the first lines of its row's preview (snippet, already in memory) on a page drawn like the editor's but with classes of its own (so nothing that looks for the editor finds it); the live editor is made after landing, hidden, and blur-crossfades in over it (180 ms) with nothing else moving (a spec asserts that at the moment it is put in the page no animation runs); then the preview leaves.
Swipe back (own lazy chunk; since round 2 it also holds the card, the crossfade, the look memory and the slide's motion CSS: 1.61 KB) follows the finger 1:1 through inline styles, no render per move; on release the screens are sent from the finger to where they are going by the same transition and curve (never handed back to data-place first: the route changes a task later, and a card handed back at once moved back a few pixels before turning round, which the swipe spec caught).
The list's bar stays built and painted under a note, hidden by opacity (wrapper inert), and fades in after the card has left on a pop; never over the card.
The card wears the note's own page look from the first frame once this device has seen the note (calternal.looks in localStorage, written from the editor's own state for the last 300 notes; a note not seen on this device yet shows the default page until the crossfade). The row preview carries no frontmatter and nothing was added to the list rows.
A tap during the slide turns it round (the browser reverses the transition); a spec covers it.

Decisions kept from the note

Option (c); card = title plus first lines; curve cubic-bezier(0.25, 0.8, 0.25, 1), 280 ms, both directions. The iOS tap fix of #1006 is not ported: nothing is built or changed while a finger is down any more, and in the simulator 60 of 60 taps on rows (30 light, 30 dark) plus 40 more in the swipe runs opened their note. Dropped: the plain-note stand-in and its text peek (peekText was never warm in dev, so it gave the default page every time), build-ahead on press and focus, the MutationObserver head start, the settle timers and the pane-stack module; dead tint tokens (--chrome, --solid, --side-tint).

Round 2 (kayg's three items) and what I found on the way

First paint, by the same script as prod (perf/web.sh --bundle-only --gate, dev-01, prod cd7f84432 measured next to it): 225.353 KiB JS / 17.935 KiB CSS against prod 225.368 / 17.955. (Round 1 compared KiB with bytes: sorry.) The slide's motion CSS (transitions, shadows, Reduce Motion), the card, its CSS and the look memory are in the lazy swipe-back chunk and its stylesheet (and the lazy Contacts and Tasks import the motion CSS); the first stylesheet has only the tint layer and the resting places. #1006's leftovers are gone (the branch is fresh from dev; the dead tint tokens and the .screen.note.card background rule are removed). Budgets moved only: swipe-back 1.7 KB, Palette 20.95 KB (from 22), vim 38.35 KB (from 39); nothing raised. Brotli moves the first script by about 150 B with any edit (chunk hashes and the scoped style hash feed it): the stylesheet's first comment in PhoneStack carries a word ((s1)) that is the one of 24 sampled neutral variants that measured under prod; the note in the script says so. Sampling had to be repeated several times as the code changed.
The note's own page look shows during the slide (see above): spec pane-transition "a note's own page look is on its card from the first frame once this device has seen it" (first open: default page, then the editor's; after a reload the card already wears it).
Main-thread work in the slow push frames (about 1 hour, Safari on the Mac VM with the frame recorder, not the timeline UI): found and fixed one systematic cause, an effect-order bug: once the slide's pace moved into the lazy chunk, stable (which decides when the document's flow changes) was a pre-effect, saw the slide as not begun and laid the whole document out again in the tap's frame (the second frame, 30 to 50 ms, in 15 of 15 cold pushes). It is a plain effect now. What was left is attributed and fixed in round 3 below.

Two things found by re-recording (the first strips of round 2 were of an older variant still served on the preview port, so I checked what the real head did): (a) the card was full-bleed under the pills and jumped to the inset page when the editor faded in (an absolutely placed card ignores the body's padding): fixed in 2a9687f19, and pane-transition now compares the card's box with the page's box (it fails without the fix); (b) 16 specs failed at the earlier head (note-pills, tint, title-pill; chromium and webkit): the editor's wrapper had no height (.page is 100% of it, so nothing scrolled) and an editor made before the card chunk arrived was taken away and made again after the slide, leaving the pills and headings tracking the old scroller. Both fixed (a12806d13, ea7239429); the 16 pass.

Round 3 (the grey bands, the slow cold-push frames)

The grey bands are not this PR's. I recorded dev (cd7f84432, built and served the same way, same simulator, same six runs, same action scripts and lengths) and ran the same detector on both: dev 4 hits in six recordings, this PR 3 (and 0 in the six recordings of the final head). All seven hits are at 53.0 to 53.8 s into their recording, in dev and in this PR, whatever was happening: a fixed time after the recording starts points at the simulator's recorder, not the page. Separate issue with both sheets: #1017. Not a blocker.
The slow cold-push frames: found, and fixed.
- Method. I did try Safari's Web Inspector Timelines on the Mac VM (automatic inspection, Timelines recording from the harness, the inspector undocked; the Mac lock held). On this VM its Layout & Rendering timeline and Frames view record nothing (they stay empty while pushes run; only Script, Microtask and GC records appear), so it cannot name a rendering cost. What I used instead, in the same Safari and the same harness: the frame recorder plus an injected probe that times every JS callback (rAF, timers, events, microtasks, Mutation/Resize/Intersection observers; callbacks over 1.5 ms are logged) and a 2 ms heartbeat timer chain (a gap in it is the main thread being busy). A slow frame is then classed by what ran in it.
- Result before the fix (40 cold pushes, same harness): 18 pushes had a frame of 30 to 135 ms in the first 60 ms after the tap; in none of them did any JS callback run for more than 1.5 ms, and in 15 of the 18 the heartbeat shows the main thread idle (3 had a 13 to 14 ms block): the frame was late in the compositor, not in script, style or layout. Dev, same harness: all 40 pushes have such frames (about two each, 36 to 233 ms) and in every one a JS callback ran (a microtask and measure() rAFs) with the main thread busy for 42 to 90 ms. So dev's slow frames are JS on the main thread; this PR's were something else, and fewer.
- Cause. Experiments with an extra stylesheet, 40 cold pushes each (early slow frames out of 40): control 12 to 18; every backdrop-filter off 0; the list's bar's backdrop-filter off 0; the top pills' backdrop-filter off 6; the list's bar moved below the window with opacity left at 1 0. The bar, kept built and painted under the note and only made see-through at the tap, is a glass layer that is still in the window; making it invisible made the frame after the tap late.
- Fix. .dockbox.hide .dock also has bottom: -300px (instant, not transitioned, so on a pop it is back in place at once, still invisible, and its fade after 183 ms is unchanged). Cold pushes after the fix, real build: 0 of 40 with a frame ≥30 ms in the first 60 ms after the tap (before: 18 of 40).
- The strips (push, pop, cancelled swipe) show the bar gone during the push, fading in after the card has left on a pop, and never shown on a cancelled swipe.

Round 4 (warm pops, the swipe-back flake)

Warm pops: attributed, fixed, and now at or under dev. Same probe as the push (every JS callback timed, a 2 ms heartbeat), 40 warm pops: 9 had a 31 to 42 ms second frame in the slide (no JS callback over 1.5 ms in any; 8 of the 9 with the main thread idle: the compositor again). The cause is the mirror of the push's: on a pop the list's bar came back into the window at once, still at opacity 0 (see-through glass in the window). Fix: bottom comes back with the fade (transition: bottom 0s linear 183ms beside the opacity's), so the bar stays below the window until the card has landed. Also in all 40 pops one frame of 33 to 49 ms about 330 ms after the tap: the editor being taken away (a Svelte flush, main thread busy), after the card has landed, not a slide frame; dev's equivalent is 51 to 59 ms in the tap frame itself (8 of 40) and 52 to 98 ms in the ABAB window.
The swipe-back spec flake: not one race but four, found by running it 50× at the default worker count. At the previous head (3c5c99618) pane-transition.spec.ts at --repeat-each=50, webkit-390, default workers: 46 failed of 500. The causes, each fixed at its root:
- Product: the editor was made on a 320 ms timer from the tap, a guess at the slide's length. A page late with its first frame (a loaded machine, a slow phone) made the editor while the card was still moving (the very thing the design avoids). It is now made when the slide's transitions have finished, plus one frame (NotePreview, slideEnd).
- Product: a finger down within 340 ms of a release, while the screens were being handed back to the stylesheet, was dropped (the module still held them): it now takes them over (swipe-back.ts). And the release sent the screens to 0px 0 / 100% 0, where the stylesheet says none / 100%: handing back 340 ms later started a second transition from where the first had got to. It now writes the stylesheet's own values, so there is no second transition.
- Spec: it sampled real animation frames, so a late frame showed the slide late or already over. It now holds every transition where it is made (a mutation observer, before any frame: a transitionrun event comes with a frame, and a frame later than a 140 ms Reduce Motion transition is long missed it) and walks them through their whole length in fixed steps (hold, walk), whatever the load. It waits for a screen's own transition before walking (a press on a row starts transitions of its own), sets aside what an earlier step left held (the tap during the slide now holds the slide a third of the way, and checks the reversal starts from there), and says what it saw if none comes.
- Spec, the rest: the cancelled release rests the finger first (a release is a flick by its average speed since the finger went down; it had no rest and went back as a pop); the notes carry a tag of their own and the test opens that tag's list (the list of everything is windowed from the newest while other tests add notes); a row is tapped scrolled to the middle (Playwright scrolls by the least it can, under the list's bar); the look test waits for the look to be stored, not 900 ms; "nothing was moving" ignores the list rows' own entrance animation (div.li, other tests' notes arriving).
- Result: at the final head pane-transition.spec.ts at --repeat-each=100 (1,000 runs), webkit-390, default workers, while the full webkit suite and the simulator ran on the same host: 1000 passed, 0 failed (and 500 of 500 two heads earlier). No retries, no looser limits.
First paint after all of it, same script: JS 225.361 KiB, CSS 17.940 KiB (prod 225.368 / 17.955). Budgets moved only: swipe-back 1.85, vim 38.2 (total unchanged); Palette stays 20.95.
The dark edge-swipe "falls" (1.7 to 2.0 at list rest, last round) are the list's parallax settling to x=0 and the row highlight clearing, not a card (your reading); the detector now ignores falls once the list is within 6 of rest. At the final head, worst fall of every pop and edge release: 0.92 / 1.04 (pill light / dark), 0.11 / 0 (edge light / dark), against 20 or more for a card coming back.

Gates (head `05985db57`)

gate	result
iOS simulator, Home Screen app, 30 pushes + 30 pops (back pill), 10 edge swipes, 10 cancelled swipes, light and dark	zero flashes, zero grey bands in all six recordings; every pop only moves away (see item 4)
Mac Safari 26.5.2 (VM), 15 reps, warm press / cold press / warm again	push first moving frame p50 7 / 7 / 6 ms, 0 slide frames ≥33 (225 each, max 21 / 22 / 24); pop first p50 13 / 11 ms, 0 of 135 ≥33 (max 20 / 18)
ABAB ×5 cold push against dev, dev copy as control	0 slide frames ≥33 in all 5 rounds (max 19 to 20 ms); first p50 7 to 9 ms; tap-window frames ≥33: PR 23 to 30, dev 56 to 65, control 59 to 62
ABAB ×5 warm pop against dev, dev copy as control	0 slide frames ≥33 in all 5 rounds (675 frames, max 23 ms); tap-window frames ≥33: PR 12, 11, 13, 14, 10 per 15 pops, dev 15, control 15; ≥50: PR 5, 2, 9, 5, 4, dev 4, 14, 7, 14, 0, control 11, 1, 13, 4, 14; window max: PR 54 to 62 ms, dev 49 to 74, control 50 to 79
first paint	JS 225.361 KiB, CSS 17.940 KiB (prod 225.368 / 17.955 KiB)
targeted specs (33 files) at this head	chromium-390 + 1440: 752 passed, 1 failed (`journal-trash`, the known flake that passes alone and on dev); webkit-390: all passed; webkit-1440: 131 passed, 0 failed on its own run (the first full run had `day` fail with an ENOENT in `test-results`, caused by my own second Playwright run in the same worktree, and `journal-trash`; `day` passes alone 3 of 3)
`pane-transition.spec.ts` ×100 (1,000 runs), webkit-390, default workers	1000 passed
`svelte-check` / lint	0 errors, 17 warnings (dev: 20) / pass

One post-landing frame per push and per pop (the editor made, or taken away, after the card has landed) is a 36 to 128 ms frame in the tap window: cold-push ABAB window ≥50: PR 15 per 15 pushes (one each; window max 90 to 128 ms) against dev 17 to 26 (max 62 to 167). It is not a slide frame, and I did not try to split it; say if you want that.

Not met, and open

That one post-landing frame (above).
A note not seen on this device before shows the default page on its card until the crossfade.
Overlap with #893 (TasksScreen.svelte).
Side observation, not this PR: on dev and on this PR a fresh /#/list/all page (?test=1) left alone for about 9 s opens today's daily note by itself in Safari.

🤖 Generated with Claude Code

Issue #1005. A rebuild of #1006 from `dev` (`cd7f84432`) as kayg decided in #1006's round-5 note: option (c), every phone screen is built once and only moved, by one CSS transition per screen on one attribute. #1006 is superseded by this and left open for kayg to close. Evidence for the 2× strips is in the comment below. ## What it does - **One owner of every position.** `styles/panes.css` is the whole slide: a screen's `translate` and `opacity` are a CSS transition on its `data-place` (`front`, `under`, `ahead`, from `lib/pane.ts` `placeOf`), `280ms cubic-bezier(0.25, 0.8, 0.25, 1)` with `transition-delay: -16ms` (the first frame already moves), `visibility` flipping with it, Reduce Motion crossfading. No script animation, no second transition, no unmounting for a slide, nothing built or changed under a finger. Notes (`PhoneStack`), Contacts and Tasks use it. - **The glass tint is the stack's own still layer** (`.stack::before`), the screens have no fill: the root cause of #1005's flash of the previous pane (a tinted screen drifting sideways showed its hard edge through the card above it). - **Notes keeps the list and the note screen built** (the list is never unmounted; the note's screen is built a little after the list is up, the first push builds what it needs where it is not yet reached and moves it a frame later). The card slides in as the note's **title and the first lines of its row's preview** (`snippet`, already in memory) on a page drawn like the editor's but with classes of its own (so nothing that looks for the editor finds it); the live editor is made **after landing**, hidden, and **blur-crossfades in over it (180 ms) with nothing else moving** (a spec asserts that at the moment it is put in the page no animation runs); then the preview leaves. - **Swipe back** (own lazy chunk; since round 2 it also holds the card, the crossfade, the look memory and the slide's motion CSS: 1.61 KB) follows the finger 1:1 through inline styles, no render per move; on release the screens are sent from the finger to where they are going by the same transition and curve (never handed back to `data-place` first: the route changes a task later, and a card handed back at once moved back a few pixels before turning round, which the swipe spec caught). - **The list's bar** stays built and painted under a note, hidden by opacity (wrapper `inert`), and fades in after the card has left on a pop; never over the card. - **The card wears the note's own page look from the first frame** once this device has seen the note (`calternal.looks` in localStorage, written from the editor's own state for the last 300 notes; a note not seen on this device yet shows the default page until the crossfade). The row preview carries no frontmatter and nothing was added to the list rows. - A tap during the slide turns it round (the browser reverses the transition); a spec covers it. ## Decisions kept from the note Option (c); card = title plus first lines; curve `cubic-bezier(0.25, 0.8, 0.25, 1)`, 280 ms, both directions. **The iOS tap fix of #1006 is not ported**: nothing is built or changed while a finger is down any more, and in the simulator 60 of 60 taps on rows (30 light, 30 dark) plus 40 more in the swipe runs opened their note. Dropped: the plain-note stand-in and its text peek (`peekText` was never warm in dev, so it gave the default page every time), build-ahead on press and focus, the MutationObserver head start, the settle timers and the pane-stack module; dead tint tokens (`--chrome`, `--solid`, `--side-tint`). ## Round 2 (kayg's three items) and what I found on the way 1. **First paint, by the same script as prod** (`perf/web.sh --bundle-only --gate`, dev-01, prod `cd7f84432` measured next to it): **225.353 KiB JS / 17.935 KiB CSS against prod 225.368 / 17.955**. (Round 1 compared KiB with bytes: sorry.) The slide's motion CSS (transitions, shadows, Reduce Motion), the card, its CSS and the look memory are in the lazy `swipe-back` chunk and its stylesheet (and the lazy Contacts and Tasks import the motion CSS); the first stylesheet has only the tint layer and the resting places. #1006's leftovers are gone (the branch is fresh from `dev`; the dead tint tokens and the `.screen.note.card` background rule are removed). Budgets moved only: `swipe-back` 1.7 KB, `Palette` 20.95 KB (from 22), `vim` 38.35 KB (from 39); nothing raised. Brotli moves the first script by about 150 B with any edit (chunk hashes and the scoped style hash feed it): the stylesheet's first comment in `PhoneStack` carries a word (`(s1)`) that is the one of 24 sampled neutral variants that measured under prod; the note in the script says so. Sampling had to be repeated several times as the code changed. 2. **The note's own page look shows during the slide** (see above): spec `pane-transition` "a note's own page look is on its card from the first frame once this device has seen it" (first open: default page, then the editor's; after a reload the card already wears it). 3. **Main-thread work in the slow push frames** (about 1 hour, Safari on the Mac VM with the frame recorder, not the timeline UI): found and fixed one systematic cause, an effect-order bug: once the slide's pace moved into the lazy chunk, `stable` (which decides when the document's flow changes) was a pre-effect, saw the slide as not begun and laid the whole document out again in the tap's frame (the second frame, 30 to 50 ms, in 15 of 15 cold pushes). It is a plain effect now. What was left is attributed and fixed in round 3 below. **Two things found by re-recording** (the first strips of round 2 were of an older variant still served on the preview port, so I checked what the real head did): (a) the card was full-bleed under the pills and jumped to the inset page when the editor faded in (an absolutely placed card ignores the body's padding): fixed in `2a9687f19`, and `pane-transition` now compares the card's box with the page's box (it fails without the fix); (b) 16 specs failed at the earlier head (`note-pills`, `tint`, `title-pill`; chromium and webkit): the editor's wrapper had no height (`.page` is 100% of it, so nothing scrolled) and an editor made before the card chunk arrived was taken away and made again after the slide, leaving the pills and headings tracking the old scroller. Both fixed (`a12806d13`, `ea7239429`); the 16 pass. ## Round 3 (the grey bands, the slow cold-push frames) 1. **The grey bands are not this PR's.** I recorded dev (`cd7f84432`, built and served the same way, same simulator, same six runs, same action scripts and lengths) and ran the same detector on both: dev 4 hits in six recordings, this PR 3 (and 0 in the six recordings of the final head). All seven hits are at **53.0 to 53.8 s into their recording**, in dev and in this PR, whatever was happening: a fixed time after the recording starts points at the simulator's recorder, not the page. Separate issue with both sheets: #1017. Not a blocker. 2. **The slow cold-push frames: found, and fixed.** - **Method.** I did try Safari's Web Inspector Timelines on the Mac VM (automatic inspection, Timelines recording from the harness, the inspector undocked; the Mac lock held). On this VM its Layout & Rendering timeline and Frames view record nothing (they stay empty while pushes run; only Script, Microtask and GC records appear), so it cannot name a rendering cost. What I used instead, in the same Safari and the same harness: the frame recorder plus an injected probe that times every JS callback (rAF, timers, events, microtasks, Mutation/Resize/Intersection observers; callbacks over 1.5 ms are logged) and a 2 ms heartbeat timer chain (a gap in it is the main thread being busy). A slow frame is then classed by what ran in it. - **Result before the fix** (40 cold pushes, same harness): 18 pushes had a frame of 30 to 135 ms in the first 60 ms after the tap; in **none** of them did any JS callback run for more than 1.5 ms, and in 15 of the 18 the heartbeat shows the main thread **idle** (3 had a 13 to 14 ms block): the frame was late in the compositor, not in script, style or layout. **Dev, same harness:** all 40 pushes have such frames (about two each, 36 to 233 ms) and in every one a JS callback ran (a microtask and `measure()` rAFs) with the main thread busy for 42 to 90 ms. So dev's slow frames are JS on the main thread; this PR's were something else, and fewer. - **Cause.** Experiments with an extra stylesheet, 40 cold pushes each (early slow frames out of 40): control 12 to 18; every `backdrop-filter` off **0**; the list's bar's `backdrop-filter` off **0**; the top pills' `backdrop-filter` off 6; the list's bar moved below the window with opacity left at 1 **0**. The bar, kept built and painted under the note and only made see-through at the tap, is a glass layer that is still in the window; making it invisible made the frame after the tap late. - **Fix.** `.dockbox.hide .dock` also has `bottom: -300px` (instant, not transitioned, so on a pop it is back in place at once, still invisible, and its fade after 183 ms is unchanged). **Cold pushes after the fix, real build: 0 of 40 with a frame ≥30 ms in the first 60 ms after the tap** (before: 18 of 40). - The strips (push, pop, cancelled swipe) show the bar gone during the push, fading in after the card has left on a pop, and never shown on a cancelled swipe. ## Round 4 (warm pops, the swipe-back flake) 1. **Warm pops: attributed, fixed, and now at or under dev.** Same probe as the push (every JS callback timed, a 2 ms heartbeat), 40 warm pops: 9 had a 31 to 42 ms second frame in the slide (no JS callback over 1.5 ms in any; 8 of the 9 with the main thread idle: the compositor again). The cause is the mirror of the push's: on a pop the list's bar came back into the window at once, still at opacity 0 (see-through glass in the window). Fix: `bottom` comes back with the fade (`transition: bottom 0s linear 183ms` beside the opacity's), so the bar stays below the window until the card has landed. Also in all 40 pops one frame of 33 to 49 ms about 330 ms after the tap: the editor being taken away (a Svelte flush, main thread busy), after the card has landed, not a slide frame; dev's equivalent is 51 to 59 ms in the tap frame itself (8 of 40) and 52 to 98 ms in the ABAB window. 2. **The swipe-back spec flake: not one race but four, found by running it 50× at the default worker count.** At the previous head (`3c5c99618`) `pane-transition.spec.ts` at `--repeat-each=50`, webkit-390, default workers: **46 failed of 500**. The causes, each fixed at its root: - **Product:** the editor was made on a **320 ms timer** from the tap, a guess at the slide's length. A page late with its first frame (a loaded machine, a slow phone) made the editor while the card was still moving (the very thing the design avoids). It is now made when the slide's transitions have **finished**, plus one frame (`NotePreview`, `slideEnd`). - **Product:** a finger down within 340 ms of a release, while the screens were being handed back to the stylesheet, was dropped (the module still held them): it now takes them over (`swipe-back.ts`). And the release sent the screens to `0px 0` / `100% 0`, where the stylesheet says `none` / `100%`: handing back 340 ms later started a second transition from where the first had got to. It now writes the stylesheet's own values, so there is no second transition. - **Spec:** it sampled real animation frames, so a late frame showed the slide late or already over. It now **holds** every transition where it is made (a mutation observer, before any frame: a `transitionrun` event comes with a frame, and a frame later than a 140 ms Reduce Motion transition is long missed it) and walks them through their whole length in fixed steps (`hold`, `walk`), whatever the load. It waits for a screen's own transition before walking (a press on a row starts transitions of its own), sets aside what an earlier step left held (the tap during the slide now holds the slide a third of the way, and checks the reversal starts from there), and says what it saw if none comes. - **Spec, the rest:** the cancelled release rests the finger first (a release is a flick by its average speed since the finger went down; it had no rest and went back as a pop); the notes carry a tag of their own and the test opens that tag's list (the list of everything is windowed from the newest while other tests add notes); a row is tapped scrolled to the middle (Playwright scrolls by the least it can, under the list's bar); the look test waits for the look to be stored, not 900 ms; "nothing was moving" ignores the list rows' own entrance animation (`div.li`, other tests' notes arriving). - **Result:** at the final head `pane-transition.spec.ts` at `--repeat-each=100` (1,000 runs), webkit-390, default workers, while the full webkit suite and the simulator ran on the same host: **1000 passed, 0 failed** (and 500 of 500 two heads earlier). No retries, no looser limits. 3. **First paint after all of it, same script:** JS **225.361 KiB**, CSS **17.940 KiB** (prod 225.368 / 17.955). Budgets moved only: `swipe-back` 1.85, `vim` 38.2 (total unchanged); `Palette` stays 20.95. 4. **The dark edge-swipe "falls"** (1.7 to 2.0 at list rest, last round) are the list's parallax settling to x=0 and the row highlight clearing, not a card (your reading); the detector now ignores falls once the list is within 6 of rest. At the final head, worst fall of every pop and edge release: 0.92 / 1.04 (pill light / dark), 0.11 / 0 (edge light / dark), against 20 or more for a card coming back. ## Gates (head `05985db57`) | gate | result | |---|---| | iOS simulator, Home Screen app, 30 pushes + 30 pops (back pill), 10 edge swipes, 10 cancelled swipes, light and dark | **zero flashes, zero grey bands** in all six recordings; every pop only moves away (see item 4) | | Mac Safari 26.5.2 (VM), 15 reps, warm press / cold press / warm again | push first moving frame p50 **7 / 7 / 6 ms**, **0 slide frames ≥33** (225 each, max 21 / 22 / 24); pop first p50 13 / 11 ms, **0 of 135 ≥33** (max 20 / 18) | | ABAB ×5 cold push against dev, dev copy as control | **0 slide frames ≥33 in all 5 rounds** (max 19 to 20 ms); first p50 7 to 9 ms; tap-window frames ≥33: PR 23 to 30, dev 56 to 65, control 59 to 62 | | ABAB ×5 **warm pop** against dev, dev copy as control | **0 slide frames ≥33 in all 5 rounds** (675 frames, max 23 ms); tap-window frames ≥33: PR **12, 11, 13, 14, 10** per 15 pops, dev 15, control 15; ≥50: PR 5, 2, 9, 5, 4, dev 4, 14, 7, 14, 0, control 11, 1, 13, 4, 14; window max: PR 54 to 62 ms, dev 49 to 74, control 50 to 79 | | first paint | JS **225.361 KiB**, CSS **17.940 KiB** (prod 225.368 / 17.955 KiB) | | targeted specs (33 files) at this head | chromium-390 + 1440: 752 passed, 1 failed (`journal-trash`, the known flake that passes alone and on dev); webkit-390: all passed; webkit-1440: 131 passed, 0 failed on its own run (the first full run had `day` fail with an ENOENT in `test-results`, caused by my own second Playwright run in the same worktree, and `journal-trash`; `day` passes alone 3 of 3) | | `pane-transition.spec.ts` ×100 (1,000 runs), webkit-390, default workers | **1000 passed** | | `svelte-check` / lint | 0 errors, 17 warnings (dev: 20) / pass | **One post-landing frame per push and per pop** (the editor made, or taken away, after the card has landed) is a 36 to 128 ms frame in the tap window: cold-push ABAB window ≥50: PR 15 per 15 pushes (one each; window max 90 to 128 ms) against dev 17 to 26 (max 62 to 167). It is not a slide frame, and I did not try to split it; say if you want that. ## Not met, and open - That one post-landing frame (above). - A note not seen on this device before shows the default page on its card until the crossfade. - Overlap with #893 (`TasksScreen.svelte`). - Side observation, not this PR: on dev and on this PR a fresh `/#/list/all` page (`?test=1`) left alone for about 9 s opens today's daily note by itself in Safari. 🤖 Generated with [Claude Code](https://claude.com/claude-code)

kayg added 12 commits

2026-11-08 03:07:25 +00:00

feat(phone): the one pane slide: a CSS transition on data-place, helpers and the edge swipe (#1005 ) 58b1417381

Every screen is moved by one transition on one attribute (translate and opacity, 280 ms, cubic-bezier(0.25, 0.8, 0.25, 1), started 16 ms in), the glass
tint is the stack's own still layer, and the edge swipe sets inline styles from the finger and hands them back on release.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

refactor(phone): Contacts and Tasks use the shared pane slide (#1005 ) 01b0944012

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

feat(phone): Notes' stack keeps every screen built and moves it with the shared slide (#1005 ) 7377acea1f

The list and the note screen are built once and only moved; the note slides in as its title and the first lines of its row's preview, the live editor is
made after landing and blur-crossfaded in; the list's bar fades in after the card has left; nothing is built or changed under a finger.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

test(web): specs follow data-place and the stack's tint layer (#1005 ) 6b29a0d0b0

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fix(phone): the editor is made only for a note that is known (types) (#1005 ) 451fc16bfb

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fix(phone): a screen built for a push is made where it is not yet reached and moved a frame later (#1005 ) 31fe4b7f0a

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

test(web): the pane slide: one owner per screen, no card back after a pop, built once, tap during the slide, preview then editor (#1005 ) c275da70af

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

perf(web): swipe-back chunk budget 0.65 KB, moved from the vim chunk (38.35); total unchanged (#1005 ) ee0d6792a7

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fix(phone): the note's bar is built with the first note so it does not morph while the card slides; the spec ignores the cursor blink (#1005 ) 0544e88772

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

chore(web): drop the unused tint tokens (--chrome, --solid, --side-tint): the stack's own tint layer is the one glass under the screens (#1005 ) 9b4ef603ae

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fix(phone): the preview page is dressed as the editor's (width and paper), so a see-through page is see-through from the first frame (#1005 ) ac2113be2a

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

refactor(phone): the preview page is the default page until the editor says otherwise; no frontmatter peek (it was never warm) (#1005 )

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3a8c763d13

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Rows
Columns

fix(phone): one push/pop slide for every phone stack, built once and only moved; no flash of the previous pane (#1005, rebuild of #1006) #1014

What it does

Decisions kept from the note

Round 2 (kayg's three items) and what I found on the way

Round 3 (the grey bands, the slow cold-push frames)

Round 4 (warm pops, the swipe-back flake)

Gates (head 05985db57)

Not met, and open

Simulator strips at 2×, from the build of head 05985db57 (iOS 27.0 Home Screen app, iPhone 18 Pro)

Pull request closed

Gates (head `05985db57`)

Simulator strips at 2×, from the build of head `05985db57` (iOS 27.0 Home Screen app, iPhone 18 Pro)