Adapt default logic to adjust scroll position only on backward scrolling (#1002)

Author: balzdur

.changeset/gorgeous-tomatoes-cry.md

@@ -0,0 +1,5 @@
+---
+'@tanstack/virtual-core': patch
+---
+
+fix(virtual-core): Adapt default logic to adjust scroll position only on backward scrolling

packages/virtual-core/src/index.ts

@@ -814,7 +814,8 @@ export class Virtualizer<
       if (
         this.shouldAdjustScrollPositionOnItemSizeChange !== undefined
           ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this)
-          : item.start < this.getScrollOffset() + this.scrollAdjustments
+          : this.scrollDirection === 'backward' &&
+            item.start < this.getScrollOffset() + this.scrollAdjustments
       ) {
         if (process.env.NODE_ENV !== 'production' && this.options.debug) {
           console.info('correction', delta)