The pager's counter runs through the posts as a flight passes them, instead of jumping on landing.

Adam, 2026-10-17: "the counter should animate as we fly, right now the current position only updates when we land". While a flight is under way (a flung finger or a spin of the wheel), each scroll counts the post under the middle of the screen (a binary search over the posts' tops); the landing sets the post landed on, as before.

tools/pager-swipe-fly-test.js: a flick from post 2 shows 2, 3, 4 … 9 on the way. pager-wheel, pager-ready-gate, profile-pager and thread-pager pass.

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

1 files changed, 14 insertions, 3 deletions

diff --git a/src/features/messages.js b/src/features/messages.js
index 76330a4..cf6e2c7 100644
--- a/src/features/messages.js
+++ b/src/features/messages.js
@@ -13172,7 +13172,7 @@ export function messagesFeature(ctx) {
     if (land) slideFrame(land, -1);
     pagerGlide(pager.scroller, 'y', dest, vel, {
       ms: screens > 1.05 ? Math.min(most, 100 + pace * screens) : 0,
-      onDone: () => { if (!pager) return; pager.flying = false; const s = pagerHere(); if (s && s !== pager.cur) pagerArrive(s); },
+      onDone: () => { if (!pager) return; pager.flying = false; const s = pagerHere(); if (s && s !== pager.cur) pagerArrive(s); pagerPosition(); },
     });
   }
   const pagerArrive = (slide) => { if (pager && pager.arrive) pager.arrive(slide); };
@@ -13201,13 +13201,24 @@ export function messagesFeature(ctx) {
     if (!pager) return;
     const groups = pagerGroups();
     const slide = pager.cur || pager.anchor;
-    const index = groups.indexOf(slide && slide.closest('.mp-group'));
-    pager.el.querySelector('.mp-position').textContent = (index < 0 ? 0 : index + 1) + ' / ' + groups.length;
+    let index = groups.indexOf(slide && slide.closest('.mp-group'));
+    // in a flight, the post passing under the reader: the count runs with
+    // the slides rather than jumping on landing (Adam, 2026-10-17: "the
+    // counter should animate as we fly")
+    if (pager.flying && groups.length) {
+      const y = pager.scroller.scrollTop + pager.scroller.clientHeight / 2;
+      let lo = 0, hi = groups.length - 1; // the last post whose top is above the middle of the screen
+      while (lo < hi) { const m = (lo + hi + 1) >> 1; if (groups[m].offsetTop <= y) lo = m; else hi = m - 1; }
+      index = lo;
+    }
+    const text = (index < 0 ? 0 : index + 1) + ' / ' + groups.length, el = pager.el.querySelector('.mp-position');
+    if (el.textContent !== text) el.textContent = text;
   }
 
   function buildPager(want) {
     const video = want.kind === 'videos';
     const scroller = h('div', { class: 'mp-scroll' });
+    scroller.addEventListener('scroll', () => { if (pager && pager.flying) pagerPosition(); }, { passive: true });
     const el = h('div', { class: 'media-pager' + (video ? ' videos' : '') + (pagerLoud ? '' : ' quiet'), role: 'dialog', 'aria-modal': 'true' },
       scroller,
       h('div', { class: 'mp-position', role: 'status' }, '0 / 0'),