update buffer based on scroll

Author: chiefcll

src/primitives/Lazy.tsx

@@ -39,8 +39,8 @@ function createLazy<T>(
       return props.buffer;
     }
     const scroll = props.scroll || props.style?.scroll;
-    if (scroll === 'always') return props.upCount;
-    if (scroll === 'center') return Math.ceil(props.upCount / 2);
+    if (!scroll || scroll === 'auto' || scroll === 'always') return props.upCount + 1;
+    if (scroll === 'center') return Math.ceil(props.upCount / 2) + 1;
     return 2;
   });