From eac07973f0a38e19b3cbab5178524f90a3b82769 Mon Sep 17 00:00:00 2001
From: Ashlee Radka <ashlee@vellum.ai>
Date: Wed, 25 Feb 2026 20:15:03 -0500
Subject: [PATCH] fix: guard trimForBackground against in-flight pagination

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .../vellum-assistant/Features/MainWindow/ThreadManager.swift    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clients/macos/vellum-assistant/Features/MainWindow/ThreadManager.swift b/clients/macos/vellum-assistant/Features/MainWindow/ThreadManager.swift
index ae8904c7b80..ae712ff12f2 100644
--- a/clients/macos/vellum-assistant/Features/MainWindow/ThreadManager.swift
+++ b/clients/macos/vellum-assistant/Features/MainWindow/ThreadManager.swift
@@ -645,7 +645,7 @@ final class ThreadManager: ObservableObject, ThreadRestorerDelegate {
         guard let previousId = activeThreadId, previousId != nextThreadId,
               let vm = chatViewModels[previousId],
               vm.isHistoryLoaded,
-              !vm.isSending, !vm.isThinking else { return }
+              !vm.isSending, !vm.isThinking, !vm.isLoadingMoreMessages else { return }
         vm.trimForBackground()
     }