tui: avoid duplicate user prompt rendering

codex-rs/tui/src/chatwidget.rs

@@ -4547,11 +4547,16 @@ impl ChatWidget {
                     && let EventMsg::UserMessage(user_message) = item.as_legacy_event()
                 {
                     let rendered = Self::rendered_user_message_event_from_event(&user_message);
-                    if self.pending_nudges.front() == Some(&rendered) {
+                    let should_render = if self.pending_nudges.front() == Some(&rendered) {
                         self.pending_nudges.pop_front();
                         self.refresh_pending_input_preview();
+                        true
+                    } else {
+                        self.last_rendered_user_message_event.as_ref() != Some(&rendered)
+                    };
+                    if should_render {
+                        self.on_user_message_event(user_message);
                     }
-                    self.on_user_message_event(user_message);
                 }
             }
             EventMsg::EnteredReviewMode(review_request) => {

codex-rs/tui/src/chatwidget/tests.rs

@@ -3626,6 +3626,24 @@ async fn raw_response_item_with_canonicalized_user_payload_clears_pending_nudge(
     assert!(lines_to_single_string(&inserted[0]).contains("hello world"));
 }
 
+#[tokio::test]
+async fn raw_response_item_does_not_duplicate_locally_rendered_user_message() {
+    let (mut chat, mut rx, _op_rx) = make_chatwidget_manual(None).await;
+    chat.thread_id = Some(ThreadId::new());
+
+    chat.bottom_pane
+        .set_composer_text("hello".to_string(), Vec::new(), Vec::new());
+    chat.handle_key_event(KeyEvent::new(KeyCode::Enter, KeyModifiers::NONE));
+
+    let inserted = drain_insert_history(&mut rx);
+    assert_eq!(inserted.len(), 1);
+    assert!(lines_to_single_string(&inserted[0]).contains("hello"));
+
+    chat.handle_codex_event(raw_user_message_event("hello"));
+
+    assert!(drain_insert_history(&mut rx).is_empty());
+}
+
 #[tokio::test]
 async fn raw_response_item_only_pops_front_pending_nudge() {
     let (mut chat, mut rx, _op_rx) = make_chatwidget_manual(None).await;