From e880185e950f24cfb7e209b58b1ba814812a62bc Mon Sep 17 00:00:00 2001
From: Damian Pieczynski <piecyk@gmail.com>
Date: Tue, 26 Sep 2023 16:47:13 +0200
Subject: [PATCH] fix: useWindowVirtualizer locking scrolling position (#592)

---
 packages/react-virtual/src/index.tsx | 1 +
 packages/solid-virtual/src/index.tsx | 2 ++
 packages/svelte-virtual/src/index.ts | 1 +
 packages/virtual-core/src/index.ts   | 2 +-
 packages/vue-virtual/src/index.ts    | 2 ++
 5 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/react-virtual/src/index.tsx b/packages/react-virtual/src/index.tsx
index 05bebb6f..29c6be8b 100644
--- a/packages/react-virtual/src/index.tsx
+++ b/packages/react-virtual/src/index.tsx
@@ -81,6 +81,7 @@ export function useWindowVirtualizer<TItemElement extends Element>(
     observeElementRect: observeWindowRect,
     observeElementOffset: observeWindowOffset,
     scrollToFn: windowScroll,
+    initialOffset: typeof document !== 'undefined' ? window.scrollY : undefined,
     ...options,
   })
 }
diff --git a/packages/solid-virtual/src/index.tsx b/packages/solid-virtual/src/index.tsx
index 8d5b1833..537519f3 100644
--- a/packages/solid-virtual/src/index.tsx
+++ b/packages/solid-virtual/src/index.tsx
@@ -122,6 +122,8 @@ export function createWindowVirtualizer<TItemElement extends Element>(
         observeElementRect: observeWindowRect,
         observeElementOffset: observeWindowOffset,
         scrollToFn: windowScroll,
+        initialOffset:
+          typeof document !== 'undefined' ? window.scrollY : undefined,
       },
       options,
     ),
diff --git a/packages/svelte-virtual/src/index.ts b/packages/svelte-virtual/src/index.ts
index 29169a4e..42621b7e 100644
--- a/packages/svelte-virtual/src/index.ts
+++ b/packages/svelte-virtual/src/index.ts
@@ -92,6 +92,7 @@ export function createWindowVirtualizer<TItemElement extends Element>(
     observeElementRect: observeWindowRect,
     observeElementOffset: observeWindowOffset,
     scrollToFn: windowScroll,
+    initialOffset: typeof document !== 'undefined' ? window.scrollY : undefined,
     ...options,
   })
 }
diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 9e69ad78..fb1d84aa 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -187,7 +187,7 @@ export const measureElement = <TItemElement extends Element>(
 export const windowScroll = <T extends Window>(
   offset: number,
   {
-    adjustments = window.scrollY,
+    adjustments = 0,
     behavior,
   }: { adjustments?: number; behavior?: ScrollBehavior },
   instance: Virtualizer<T, any>,
diff --git a/packages/vue-virtual/src/index.ts b/packages/vue-virtual/src/index.ts
index be7e7977..8cf49837 100644
--- a/packages/vue-virtual/src/index.ts
+++ b/packages/vue-virtual/src/index.ts
@@ -106,6 +106,8 @@ export function useWindowVirtualizer<TItemElement extends Element>(
       observeElementRect: observeWindowRect,
       observeElementOffset: observeWindowOffset,
       scrollToFn: windowScroll,
+      initialOffset:
+        typeof document !== 'undefined' ? window.scrollY : undefined,
       ...unref(options),
     })),
   )