feat: close #2545 improve lazy load message list

app/components/markdown.tsx

@@ -146,70 +146,23 @@ export function Markdown(
   } & React.DOMAttributes<HTMLDivElement>,
 ) {
   const mdRef = useRef<HTMLDivElement>(null);
-  const renderedHeight = useRef(0);
-  const renderedWidth = useRef(0);
-  const inView = useRef(!!props.defaultShow);
-  const [_, triggerRender] = useState(0);
-  const checkInView = useThrottledCallback(
-    () => {
-      const parent = props.parentRef?.current;
-      const md = mdRef.current;
-      if (parent && md && !props.defaultShow) {
-        const parentBounds = parent.getBoundingClientRect();
-        const twoScreenHeight = Math.max(500, parentBounds.height * 2);
-        const mdBounds = md.getBoundingClientRect();
-        const parentTop = parentBounds.top - twoScreenHeight;
-        const parentBottom = parentBounds.bottom + twoScreenHeight;
-        const isOverlap =
-          Math.max(parentTop, mdBounds.top) <=
-          Math.min(parentBottom, mdBounds.bottom);
-        inView.current = isOverlap;
-        triggerRender(Date.now());
-      }
-
-      if (inView.current && md) {
-        const rect = md.getBoundingClientRect();
-        renderedHeight.current = Math.max(renderedHeight.current, rect.height);
-        renderedWidth.current = Math.max(renderedWidth.current, rect.width);
-      }
-      // eslint-disable-next-line react-hooks/exhaustive-deps
-    },
-    300,
-    {
-      leading: true,
-      trailing: true,
-    },
-  );
-
-  useEffect(() => {
-    props.parentRef?.current?.addEventListener("scroll", checkInView);
-    checkInView();
-    return () =>
-      props.parentRef?.current?.removeEventListener("scroll", checkInView);
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, []);
-
-  const getSize = (x: number) => (!inView.current && x > 0 ? x : "auto");
 
   return (
     <div
       className="markdown-body"
       style={{
         fontSize: `${props.fontSize ?? 14}px`,
-        height: getSize(renderedHeight.current),
-        width: getSize(renderedWidth.current),
         direction: /[\u0600-\u06FF]/.test(props.content) ? "rtl" : "ltr",
       }}
       ref={mdRef}
       onContextMenu={props.onContextMenu}
       onDoubleClickCapture={props.onDoubleClickCapture}
     >
-      {inView.current &&
-        (props.loading ? (
-          <LoadingIcon />
-        ) : (
-          <MarkdownContent content={props.content} />
-        ))}
+      {props.loading ? (
+        <LoadingIcon />
+      ) : (
+        <MarkdownContent content={props.content} />
+      )}
     </div>
   );
 }