From eb5e2e65af5e9fccc48fecbe839f7b1e35e1b059 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Sat, 17 Oct 2026 08:36:39 -0700
Subject: A touch stops a pager flight on the post most on screen: a tap only
 stops it, a swipe back from there is the post before, and one the way it was
 flying takes it on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013ZDf1cyCQLkfjftYhymZAg
---
 src/features/messages.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'src/features/messages.js')

diff --git a/src/features/messages.js b/src/features/messages.js
index 82810c3..254ec66 100644
--- a/src/features/messages.js
+++ b/src/features/messages.js
@@ -13184,6 +13184,7 @@ export function messagesFeature(ctx) {
     const dest = pagerAt(pager.scroller, to, true);
     const screens = Math.abs(dest - pager.scroller.scrollTop) / Math.max(1, pager.scroller.clientHeight);
     pager.flying = true;
+    pager.flyDir = Math.sign(dest - pager.scroller.scrollTop);
     const land = pager.kind === 'videos' && !frugalData() && rowSlide(to); // the landing's first frame, fetched on the way
     if (land) slideFrame(land, -1);
     // A flight eases out on a square, not a cube: on a cube a long one
@@ -13199,6 +13200,14 @@ export function messagesFeature(ctx) {
     });
   }
   const pagerArrive = (slide) => { if (pager && pager.arrive) pager.arrive(slide); };
+  // A finger down on a flight stops it there and then, settling on the post
+  // most on screen (Adam, 2026-10-17: "Tapping … should instantly stop the
+  // flying … and snap to the video that's most on screen").
+  function pagerCatch() {
+    pagerHold(pager.scroller); // the flight's onDone: no longer flying, arrived at the post most on screen
+    const here = pagerHere(), g = here && here.closest('.mp-group');
+    if (g) pagerGlide(pager.scroller, 'y', pagerAt(pager.scroller, g, true));
+  }
   // the sideways arrows show only where the post has a picture that way
   function pagerArrows(slide) {
     if (!pager || !slide) return;
@@ -13325,10 +13334,16 @@ export function messagesFeature(ctx) {
     let touch = null, pendingTap = 0, tapDoneAt = 0;
     el.addEventListener('touchstart', (e) => {
       const t = e.touches[0];
+      // caught in flight: stopped where it is (a two-finger touch, a touch
+      // on the seek bar too); a swipe back from there is the post before it
+      // however hard (Adam, 2026-10-17: "reverse swiping should go to the
+      // previous video"), one on the way it was flying takes it on
+      const caught = !!pager && pager.flying && !!pager.scroller._glide ? pager.flyDir || 0 : 0;
+      if (caught) pagerCatch();
       const img = e.target.closest && e.target.closest('img.mp-media');
       // not a touch on the seek bar, in an opened caption, or on a picture zoomed in (each its own)
       touch = e.touches.length === 1 && pager && !e.target.closest('.mp-seek, .mp-caption.open') && !(img && img.style.touchAction === 'none')
-        ? { x: t.clientX, y: t.clientY, at: Date.now(), slide: pager.cur, target: e.target } : null;
+        ? { x: t.clientX, y: t.clientY, at: Date.now(), slide: pager.cur, target: e.target, caught } : null;
     }, { passive: true });
     el.addEventListener('touchmove', (e) => {
       const d = touch;
@@ -13366,7 +13381,7 @@ 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 && pagerCanFly() ? 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() && !(d.caught && step !== d.caught) ? 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
@@ -13400,6 +13415,8 @@ export function messagesFeature(ctx) {
         settle(d, go ? (delta < 0 ? 1 : -1) : 0, go ? vel : 0);
         if (!tap) return;
       }
+      // the tap that caught a flight only stopped it (the buttons still work)
+      if (d.caught && !(d.target.closest && d.target.closest('button, a'))) { tapDoneAt = Date.now(); return; }
       if (Date.now() - d.at > 500) return; // a press, not a tap
       clearTimeout(pendingTap);
       pendingTap = setTimeout(() => {
-- 
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