From c9e9506ebdd2599b2ee3cb9bce773a311b93b89a Mon Sep 17 00:00:00 2001
From: plebeius <tom@plebbitlabs.com>
Date: Sun, 1 Mar 2026 19:05:36 +0800
Subject: [PATCH] fix(replies-preview): stable sort when recency yields
 identical Infinity values

---
 src/lib/utils/replies-preview-utils.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/lib/utils/replies-preview-utils.ts b/src/lib/utils/replies-preview-utils.ts
index ce78ef49..662a0cf4 100644
--- a/src/lib/utils/replies-preview-utils.ts
+++ b/src/lib/utils/replies-preview-utils.ts
@@ -27,8 +27,12 @@ export function getPreviewDisplayReplies<T extends CommentLike>(replies: T[], vi
     return Number.NEGATIVE_INFINITY;
   };
 
-  const newestFirst = [...replies].sort((a, b) => getRecency(b) - getRecency(a));
-  return newestFirst.slice(0, visibleCount).reverse();
+  const tagged = replies.map((reply, i) => ({ reply, recency: getRecency(reply), i }));
+  tagged.sort((a, b) => (a.recency !== b.recency ? b.recency - a.recency : a.i - b.i));
+  return tagged
+    .slice(0, visibleCount)
+    .reverse()
+    .map((t) => t.reply);
 }
 
 export interface ComputeOmittedParams {