fix: #244 better scroll ux

app/components/home.tsx

@@ -102,7 +102,7 @@ export function ChatList() {
       state.currentSessionIndex,
       state.selectSession,
       state.removeSession,
-    ]
+    ],
   );
 
   return (
@@ -196,7 +196,7 @@ export function Chat(props: {
       setPromptHints(promptStore.search(text));
     },
     100,
-    { leading: true, trailing: true }
+    { leading: true, trailing: true },
   );
 
   const onPromptSelect = (prompt: Prompt) => {
@@ -210,7 +210,7 @@ export function Chat(props: {
     if (!dom) return;
     const paddingBottomNum: number = parseInt(
       window.getComputedStyle(dom).paddingBottom,
-      10
+      10,
     );
     dom.scrollTop = dom.scrollHeight - dom.offsetHeight + paddingBottomNum;
   };
@@ -300,7 +300,7 @@ export function Chat(props: {
               preview: true,
             },
           ]
-        : []
+        : [],
     )
     .concat(
       userInput.length > 0
@@ -312,14 +312,24 @@ export function Chat(props: {
               preview: true,
             },
           ]
-        : []
+        : [],
     );
 
   // auto scroll
   useLayoutEffect(() => {
     setTimeout(() => {
       const dom = latestMessageRef.current;
-      if (dom && !isIOS() && autoScroll) {
+      const inputDom = inputRef.current;
+
+      // only scroll when input overlaped message body
+      let shouldScroll = true;
+      if (dom && inputDom) {
+        const domRect = dom.getBoundingClientRect();
+        const inputRect = inputDom.getBoundingClientRect();
+        shouldScroll = domRect.top > inputRect.top;
+      }
+
+      if (dom && autoScroll && shouldScroll) {
         dom.scrollIntoView({
           block: "end",
         });
@@ -340,7 +350,7 @@ export function Chat(props: {
               const newTopic = prompt(Locale.Chat.Rename, session.topic);
               if (newTopic && newTopic !== session.topic) {
                 chatStore.updateCurrentSession(
-                  (session) => (session.topic = newTopic!)
+                  (session) => (session.topic = newTopic!),
                 );
               }
             }}
@@ -586,7 +596,7 @@ export function Home() {
       state.newSession,
       state.currentSessionIndex,
       state.removeSession,
-    ]
+    ],
   );
   const loading = !useHasHydrated();
   const [showSideBar, setShowSideBar] = useState(true);