The video pager flies only once ten clips are ready to play; until then a flick or a spin of the wheel is one post at a time.

Adam, 2026-10-17: "let's not allow flying/coasting until we have at least 10 videos fully warmed up". Right after a refresh a fling outran the warming, landing on whatever was ready while clips joined around it. Ready is in the carousel: the clip's first frame on its slide and its opening cached. Picture pagers and Data Saver are unchanged.

tools/pager-ready-gate-test.js: with four clips ready a hard flick goes one post (it came round to the first with the gate off). pager-swipe-fly and pager-wheel pass; feed-pager-ahead fails the same two picture checks as before.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_013ZDf1cyCQLkfjftYhymZAg

1 files changed, 17 insertions, 0 deletions

diff --git a/tools/pager-ready-gate-test.js b/tools/pager-ready-gate-test.js
index d6df826..613f7d5 100644
--- a/tools/pager-ready-gate-test.js
+++ b/tools/pager-ready-gate-test.js
@@ -122,6 +122,23 @@ try {
   await page.keyboard.press('ArrowUp');
   check('a step back up lands on the one that joined', await waitFor(() => { const s = document.querySelector('.mp-slide.mp-cur'); return !!s && /tall2/.test(s.getAttribute('data-k')) && !s.querySelector('video').paused; }, null, 6000), String(await curClip()));
 
+  console.log('\n[no flying with fewer than ten clips ready]');
+  await sleep(500);
+  const ready = (await inCarousel()).split(' ').length;
+  // a hard flick (600px in 80ms): a flight's worth, were flying allowed
+  await page.evaluate(() => {
+    const el = document.querySelector('.mp-scroll'), target = document.elementFromPoint(195, 700) || el;
+    const touch = (y) => new Touch({ identifier: 1, target, clientX: 195, clientY: y, pageX: 195, pageY: y });
+    const fire = (type, y, up) => target.dispatchEvent(new TouchEvent(type, { bubbles: true, cancelable: true, touches: up ? [] : [touch(y)], changedTouches: [touch(y)], targetTouches: up ? [] : [touch(y)] }));
+    const t0 = performance.now();
+    fire('touchstart', 700);
+    for (let i = 1; i <= 3; i++) { while (performance.now() < t0 + 80 * i / 3); fire('touchmove', 700 - 600 * i / 3); }
+    fire('touchend', 100, true);
+  });
+  check('with ' + ready + ' clips ready, a hard flick from tall2 goes one post, to tall3', ready < 10 && await waitFor(() => { const s = document.querySelector('.mp-slide.mp-cur'); return !!s && /tall3/.test(s.getAttribute('data-k')); }, null, 4000), String(await curClip()));
+  await page.keyboard.press('ArrowUp');
+  await waitFor(() => /tall2/.test(document.querySelector('.mp-slide.mp-cur')?.getAttribute('data-k') || ''), null, 4000);
+
   console.log('\n[the toggle in the pager]');
   check('the pager\'s toggle says tall only', (await page.evaluate(() => document.querySelector('.mp-fit')?.textContent)) === 'Tall only');
   await page.evaluate(() => document.querySelector('.mp-fit').click());