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, 9 insertions, 2 deletions

diff --git a/src/features/messages.js b/src/features/messages.js
index cf6e2c7..654b6d5 100644
--- a/src/features/messages.js
+++ b/src/features/messages.js
@@ -13139,6 +13139,13 @@ export function messagesFeature(ctx) {
   // it is passing and steps back from there; a touch or a key catches it
   // too (pagerHold → onDone). A notch from rest is the single step it was.
   let fly = null; // { to: the post flown to, n: notches in this run, at, dir }
+  // A video pager flies only once ten clips are ready to play (in the
+  // carousel): before that a fling outran the warming, landing on whatever
+  // was ready and fighting the clips joining (Adam, 2026-10-17: "let's not
+  // allow flying/coasting until we have at least 10 videos fully warmed
+  // up"). Until then a flick or a spin of the wheel is one post at a time.
+  const PAGER_FLY_READY = 10;
+  const pagerCanFly = () => !pager || pager.kind !== 'videos' || frugalData() || pagerGroups().length >= PAGER_FLY_READY;
   function pagerFly(dir, now) {
     if (!pager) return;
     const stops = pagerGroups();
@@ -13153,7 +13160,7 @@ export function messagesFeature(ctx) {
       const here = pagerHere();
       from = here && here.closest('.mp-group');
     }
-    const next = stops.indexOf(from) + dir * (n <= 2 ? 1 : 2);
+    const next = stops.indexOf(from) + dir * (n <= 2 || !pagerCanFly() ? 1 : 2);
     const i = (next % stops.length + stops.length) % stops.length;
     if (next < 0 || next >= stops.length) { fly = null; pagerWrap(stops[i]); return; }
     const to = stops[i];
@@ -13339,7 +13346,7 @@ export function messagesFeature(ctx) {
       if (!stops.length) return;
       // the stop it set off from, then one along (or back) — or, flung, several
       const from = stops.reduce((bi, p, i) => (Math.abs(p - d.start) < Math.abs(stops[bi] - d.start) ? i : bi), 0);
-      const posts = y && step && Math.abs(vel) >= FLY_V ? Math.min(FLY_MAX, Math.max(1, Math.round(Math.abs(vel) * FLY_TAU / Math.max(1, box.clientHeight)))) : 1;
+      const posts = y && step && Math.abs(vel) >= FLY_V && pagerCanFly() ? Math.min(FLY_MAX, Math.max(1, Math.round(Math.abs(vel) * FLY_TAU / Math.max(1, box.clientHeight)))) : 1;
       const next = from + step * posts;
       // Past either end, round to the other: the first post (going up, the
       // last) — a step, or a fling whose coast is mostly beyond the end. A