From 437be55a88aa44bce81d2a1f701ad3e5b2ee75d7 Mon Sep 17 00:00:00 2001
From: Maxim Dolgolyov <maxim.dolgolyov@gmail.com>
Date: Sat, 30 May 2026 15:07:32 +0300
Subject: [PATCH] =?UTF-8?q?@=20fix(chemistry-8):=20=D0=BD=D0=B5=20=D0=BF?=
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Автофокус поля ответа (renderTask) браузер сопровождал прокруткой к блоку
задач внизу секции, перебивая scrollTo(top:0). Добавлен focus({preventScroll:true}).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@
---
 frontend/js/chem8_engine.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/frontend/js/chem8_engine.js b/frontend/js/chem8_engine.js
index c49a062..a4893d0 100644
--- a/frontend/js/chem8_engine.js
+++ b/frontend/js/chem8_engine.js
@@ -306,7 +306,8 @@
     updateScoreBar(sec); renderNav(sec); doRender(area);
     if (!done && !isMcq) {
       var inp = document.getElementById('ainp' + sec);
-      setTimeout(function () { if (inp) inp.focus(); }, 80);
+      // preventScroll: иначе фокус прокручивает страницу к блоку задач (внизу §)
+      setTimeout(function () { if (inp) { try { inp.focus({ preventScroll: true }); } catch (e) { inp.focus(); } } }, 80);
       if (inp) inp.addEventListener('keydown', function (e) { if (e.key === 'Enter') checkNum(sec); });
     }
   }