From 2b0baf97bd176dfbb9afe81931c90bc6288ada34 Mon Sep 17 00:00:00 2001
From: Adam <2363879+adamdotdevin@users.noreply.github.com>
Date: Tue, 24 Mar 2026 18:49:14 -0500
Subject: Reapply "fix(app): more startup efficiency (#18985)"

This reverts commit cbe1337f2401066cf33eb9009b597eafb49123ba.
---
 .../app/src/pages/session/use-session-hash-scroll.ts   | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'packages/app/src/pages/session')

diff --git a/packages/app/src/pages/session/use-session-hash-scroll.ts b/packages/app/src/pages/session/use-session-hash-scroll.ts
index 5fadb1f22..c582749d1 100644
--- a/packages/app/src/pages/session/use-session-hash-scroll.ts
+++ b/packages/app/src/pages/session/use-session-hash-scroll.ts
@@ -8,6 +8,9 @@ export const useSessionHashScroll = (input: {
   sessionID: () => string | undefined
   messagesReady: () => boolean
   visibleUserMessages: () => UserMessage[]
+  historyMore: () => boolean
+  historyLoading: () => boolean
+  loadMore: (sessionID: string) => Promise<void>
   turnStart: () => number
   currentMessageId: () => string | undefined
   pendingMessage: () => string | undefined
@@ -181,6 +184,21 @@ export const useSessionHashScroll = (input: {
     queue(() => scrollToMessage(msg, "auto"))
   })
 
+  createEffect(() => {
+    const sessionID = input.sessionID()
+    if (!sessionID || !input.messagesReady()) return
+
+    visibleUserMessages()
+
+    let targetId = input.pendingMessage()
+    if (!targetId && !clearing) targetId = messageIdFromHash(location.hash)
+    if (!targetId) return
+    if (messageById().has(targetId)) return
+    if (!input.historyMore() || input.historyLoading()) return
+
+    void input.loadMore(sessionID)
+  })
+
   onMount(() => {
     if (typeof window !== "undefined" && "scrollRestoration" in window.history) {
       window.history.scrollRestoration = "manual"
-- 
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