chat: persist selected thread

Author: williamstein

src/packages/frontend/chat/actions.ts

@@ -1207,6 +1207,13 @@ export class ChatActions extends Actions<ChatState> {
       showPreview,
     });
   };
+
+  setSelectedThread = (threadKey: string | null) => {
+    this.frameTreeActions?.set_frame_data({
+      id: this.frameId,
+      selectedThreadKey: threadKey,
+    });
+  };
 }
 
 // We strip out any cased version of the string @chatgpt and also all mentions.

src/packages/frontend/chat/chatroom.tsx

@@ -141,14 +141,15 @@ export function ChatRoom({
   const [filterRecentOpen, setFilterRecentOpen] = useState<boolean>(false);
   const threads = useThreadList(messages);
   const [selectedThreadKey, setSelectedThreadKey0] = useState<string | null>(
-    null,
+    desc?.get("data-selectedThreadKey") ?? null,
   );
-  const setSelectedThreadKey = (x) => {
+  const setSelectedThreadKey = (x: string | null) => {
     if (x != null && x != ALL_THREADS_KEY) {
       actions.clearAllFilters();
       actions.setFragment();
     }
     setSelectedThreadKey0(x);
+    actions.setSelectedThread?.(x);
   };
   const [lastThreadKey, setLastThreadKey] = useState<string | null>(null);
   const [renamingThread, setRenamingThread] = useState<string | null>(null);