fix: dynamic size not working properly when working with RWD

.changeset/tricky-cameras-flow.md

@@ -0,0 +1,5 @@
+---
+"react-cool-virtual": patch
+---
+
+fix: dynamic size not working properly when working with RWD

README.md

@@ -299,6 +299,8 @@ const List = () => {
 };
 ```
 
+> 💡 If the item size is specified through the function of `itemSize`, please ensure there's no the [measureRef](#items) on the item element. Otherwise, the hook will use the measured (cached) size for the item. When working with RWD, we can only use either of the two.
+
 ### Scroll to Offset/Items
 
 You can imperatively scroll to offset or items as follows:

src/useVirtual.ts

@@ -421,13 +421,15 @@ export default <
         msDataRef.current[msDataRef.current.length - 1]?.end;
 
       outerRectRef.current = rect;
-      measureItems(isSameWidth);
+      measureItems(hasDynamicSizeRef.current || isSameWidth);
       handleScroll(scrollOffsetRef.current);
 
       if (onResizeRef.current) onResizeRef.current(rect);
 
+      if (hasDynamicSizeRef.current || isSameWidth) return;
+
       const totalSize = msDataRef.current[msDataRef.current.length - 1]?.end;
-      const ratio = !isSameWidth && totalSize / prevTotalSize;
+      const ratio = totalSize / prevTotalSize;
 
       if (ratio) scrollTo(scrollOffsetRef.current * ratio);
     },