From f97c9c8bb1677b400d4970f4992f3631f909eade Mon Sep 17 00:00:00 2001
From: Damian Pieczynski <piecyk@gmail.com>
Date: Mon, 5 May 2025 19:26:06 +0200
Subject: [PATCH 1/2] fix(virtual-core): loosen approxEqual to allow 1px
 difference

---
 packages/virtual-core/src/index.ts | 15 +++------------
 packages/virtual-core/src/utils.ts |  2 +-
 2 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 6aad9d6d1..3c704059c 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -904,16 +904,7 @@ export class Virtualizer<
       toOffset -= size
     }
 
-    const scrollSizeProp = this.options.horizontal
-      ? 'scrollWidth'
-      : 'scrollHeight'
-    const scrollSize = this.scrollElement
-      ? 'document' in this.scrollElement
-        ? this.scrollElement.document.documentElement[scrollSizeProp]
-        : this.scrollElement[scrollSizeProp]
-      : 0
-
-    const maxOffset = scrollSize - size
+    const maxOffset = this.getTotalSize() - size
 
     return Math.max(Math.min(maxOffset, toOffset), 0)
   }
@@ -1010,8 +1001,8 @@ export class Virtualizer<
           const [latestOffset] = notUndefined(
             this.getOffsetForIndex(index, align),
           )
-
-          if (!approxEqual(latestOffset, this.getScrollOffset())) {
+          const currentScrollOffset = this.getScrollOffset()
+          if (!approxEqual(latestOffset, currentScrollOffset)) {
             this.scrollToIndex(index, { align, behavior })
           }
         } else {
diff --git a/packages/virtual-core/src/utils.ts b/packages/virtual-core/src/utils.ts
index 9ebf8e76b..1bb4615c2 100644
--- a/packages/virtual-core/src/utils.ts
+++ b/packages/virtual-core/src/utils.ts
@@ -83,7 +83,7 @@ export function notUndefined<T>(value: T | undefined, msg?: string): T {
   }
 }
 
-export const approxEqual = (a: number, b: number) => Math.abs(a - b) < 1
+export const approxEqual = (a: number, b: number) => Math.abs(a - b) <= 1
 
 export const debounce = (
   targetWindow: Window & typeof globalThis,

From e538844fb87a09414284660ea3f3929b326cb83f Mon Sep 17 00:00:00 2001
From: Damian Pieczynski <piecyk@gmail.com>
Date: Mon, 5 May 2025 19:30:01 +0200
Subject: [PATCH 2/2] Create fluffy-books-attend.md

---
 .changeset/fluffy-books-attend.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/fluffy-books-attend.md

diff --git a/.changeset/fluffy-books-attend.md b/.changeset/fluffy-books-attend.md
new file mode 100644
index 000000000..0aa286308
--- /dev/null
+++ b/.changeset/fluffy-books-attend.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/virtual-core': patch
+---
+
+fix(virtual-core): loosen approxEqual to allow 1px difference