Fix chat sliding when the iPhone keyboard opens

Size the shell to the visible area while a field is focused, tuck the bottom bar away, and refit the chat as the keyboard comes and goes.

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

public/chat-view.js

@@ -345,10 +345,11 @@ async function chAnnounceCard(el) {
 function chFit() {
   const m = chMounted() && ch.root.querySelector('.sgm'); if (!m || m.offsetParent === null) return;
   if (window.innerWidth >= 1024) { m.style.height = ''; return; }
-  let bottom = window.visualViewport ? window.visualViewport.height : window.innerHeight;
+  let bottom = window.visualViewport ? window.visualViewport.offsetTop + window.visualViewport.height : window.innerHeight; // (page coordinates: the visible area can be panned down while the keyboard is up)
   const top0 = m.getBoundingClientRect().top; // (look up from the screen's edge for the first spot that is page content, not the bottom bar or mini player)
   for (let y = Math.floor(bottom) - 2; y > top0 + 130; y -= 4) { const hit = document.elementsFromPoint(innerWidth / 2, y).find(e => !e.closest('.sgm')); const covers = hit && !hit.closest('#view'); if (!covers) { bottom = y + 4; break; } }
-  const top = m.getBoundingClientRect().top; m.style.height = Math.max(260, Math.floor(bottom - top - 10)) + 'px';
+  const top = m.getBoundingClientRect().top; m.style.height = Math.max(document.body.classList.contains('kb') ? 150 : 260, Math.floor(bottom - top - 10)) + 'px';
 }
+window.addEventListener('kbfit', () => { chFit(); if (!chMounted() || !chq('.sgm')) return; const v = document.getElementById('view'); if (v) v.scrollTop = 0; const l = chq('#chmsgs'); if (l && document.activeElement && document.activeElement.id === 'chtext') l.scrollTop = l.scrollHeight; }); // (the keyboard came or went: refit, and keep the newest message in sight)
 window.addEventListener('resize', chFit); if (window.visualViewport) window.visualViewport.addEventListener('resize', chFit);
 setInterval(chFit, 700);

public/shell.js

@@ -68,3 +68,22 @@
     else if (!e.shiftKey && (document.activeElement === last || !s.contains(document.activeElement))) { e.preventDefault(); first.focus(); }
   });
 })();
+
+// ---- iPhone keyboard: iOS shrinks only the visual viewport when the keyboard opens and pans the whole page to reveal the field, so the app used to slide up with it.
+// Pin the shell to what is really visible while typing and tuck the bottom bar away; chat and mail size themselves again on 'kbfit'.
+(function () {
+  const vv = window.visualViewport; if (!vv || !matchMedia('(pointer: coarse)').matches) return;
+  const root = document.documentElement; let raf = 0;
+  const typing = () => { const a = document.activeElement; return !!a && (a.tagName === 'TEXTAREA' || a.isContentEditable || (a.tagName === 'INPUT' && !/^(checkbox|radio|button|submit|reset|range|file|color|image)$/.test(a.type))); };
+  function apply() {
+    raf = 0;
+    const kb = typing() && window.innerHeight - vv.height > 120 && window.innerWidth < 768;
+    document.body.classList.toggle('kb', kb);
+    if (kb) { root.style.setProperty('--vvh', vv.height + 'px'); root.style.setProperty('--vvt', vv.offsetTop + 'px'); if (window.scrollY) window.scrollTo(0, 0); }
+    else { root.style.removeProperty('--vvh'); root.style.removeProperty('--vvt'); }
+    window.dispatchEvent(new Event('kbfit'));
+  }
+  const soon = () => { if (!raf) raf = requestAnimationFrame(apply); };
+  vv.addEventListener('resize', soon); vv.addEventListener('scroll', soon);
+  document.addEventListener('focusin', soon); document.addEventListener('focusout', () => setTimeout(soon, 80));
+})();

public/style.css

@@ -264,6 +264,14 @@ body { -webkit-touch-callout: none; }
 button, a, .row { -webkit-user-select: none; user-select: none; }
 input, textarea, [contenteditable], .sheet p, .card p, #view .sub { -webkit-user-select: text; user-select: text; }
 
+/* iPhone keyboard (shell.js adds body.kb while a field is focused and the keyboard is up): the shell is exactly the visible area, with no bottom bar in the way */
+@media (max-width: 767px) {
+  body.kb { overflow: hidden; }
+  body.kb #shell { height: var(--vvh, 100dvh); transform: translateY(var(--vvt, 0px)); }
+  body.kb #nav, body.kb #player, body.kb #upd, body.kb #toast { display: none; }
+  body.kb .sgm { min-height: 0; }
+}
+
 /* "A new version is available" notice */
 #upd { position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(var(--nav-h) + var(--sab) + 70px); z-index: 30; display: flex; align-items: center; gap: 12px;
   background: var(--text); color: var(--bg); padding: 8px 8px 8px 16px; border-radius: 14px; box-shadow: 0 6px 24px rgba(0,0,0,.35); max-width: 92vw; }

public/sw.js

@@ -1,5 +1,5 @@
 // App-shell cache only; Seafile/API traffic always goes to the network.
-const CACHE = 'hub-v88';
+const CACHE = 'hub-v89';
 const SHARE = 'hub-share'; // files shared into the app from other apps, held until the person picks a folder
 const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];