Restore resident links in stitched legacy history

Recover missing sender UUIDs for plaintext transcript rows from existing name caches while normalizing stitched history. Preserve explicit ChatService and system IDs so resident headers regain icons and profile actions without scheduling name lookups.

Validated with the RelWithDebInfo secondlife-bin build and the LLChatServiceHistoryCore test suite (11 tests).

1 files changed, 17 insertions, 2 deletions

diff --git a/indra/newview/llimview.cpp b/indra/newview/llimview.cpp
index da3d2b243a..c6425aa529 100644
--- a/indra/newview/llimview.cpp
+++ b/indra/newview/llimview.cpp
@@ -1473,9 +1473,24 @@ void LLIMModel::LLIMSession::replaceHistoricalMessages(const chat_message_list_t
     chat_message_list_t historical;
     for (const LLSD& source : history)
     {
+        const std::string from = source[LL_IM_FROM].asString();
+        LLUUID from_id;
+
+        // Plaintext transcripts store sender names but usually omit UUIDs. Recover
+        // resident identity from local name caches without scheduling a lookup.
+        if (source[LL_IM_FROM_ID].isDefined())
+        {
+            from_id = source[LL_IM_FROM_ID].asUUID();
+        }
+        else
+        {
+            const std::string legacy_name = gCacheName->buildLegacyName(from);
+            from_id = LLAvatarNameCache::getInstance()->findIdByName(legacy_name);
+        }
+
         LLSD message = source;
-        message["from"] = source[LL_IM_FROM];
-        message["from_id"] = source[LL_IM_FROM_ID];
+        message["from"] = from;
+        message["from_id"] = from_id;
         message["message"] = source[LL_IM_TEXT];
         message["time"] = source[LL_IM_TIME];
         message["timestamp"] = 0;