tui: refine slash help search controls

Co-authored-by: Codex <noreply@openai.com>

codex-rs/tui/src/bottom_pane/help_view.rs

@@ -212,7 +212,7 @@ impl SlashHelpView {
             ]);
         }
 
-        Line::from(vec![
+        let mut spans = vec![
             key_hint::plain(KeyCode::Up).into(),
             "/".into(),
             key_hint::plain(KeyCode::Down).into(),
@@ -222,11 +222,16 @@ impl SlashHelpView {
             key_hint::plain(KeyCode::PageDown).into(),
             " page  ".dim(),
             "/ search  ".dim(),
-            "n/p match  ".dim(),
+        ];
+        if !self.search.active_query.is_empty() {
+            spans.push("n/p match  ".dim());
+        }
+        spans.extend([
             "q/".dim(),
             key_hint::plain(KeyCode::Esc).into(),
             " close".dim(),
-        ])
+        ]);
+        Line::from(spans)
     }
 
     fn wrap_rows(rows: &[HelpRow], width: u16) -> (Vec<Line<'static>>, Vec<usize>, Vec<usize>) {
@@ -321,7 +326,10 @@ impl BottomPaneView for SlashHelpView {
                 modifiers: KeyModifiers::NONE,
                 ..
             } => {
-                self.search.input = Some(self.search.active_query.clone());
+                self.search.active_query.clear();
+                self.search.selected_match = 0;
+                self.follow_selected_match.set(false);
+                self.search.input = Some(String::new());
             }
             KeyEvent {
                 code: KeyCode::Up, ..

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__slash_help_output.snap

@@ -240,4 +240,4 @@ expression: popup
         /debug-m-drop
 
   /debug-m-update
-  ↑/↓ scroll  pgup/pgdn page  / search  n/p match  q/esc close                           1-233/239
+  ↑/↓ scroll  pgup/pgdn page  / search  q/esc close                                      1-233/239

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

@@ -6076,6 +6076,28 @@ async fn slash_help_search_navigates_matches_with_n_and_p() {
     assert!(previous.contains("2/3 |"));
 }
 
+#[tokio::test]
+async fn slash_help_search_restarts_from_empty_input() {
+    let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;
+
+    chat.dispatch_command(SlashCommand::Help);
+    chat.handle_key_event(KeyEvent::from(KeyCode::Char('/')));
+    for ch in "maintainers".chars() {
+        chat.handle_key_event(KeyEvent::from(KeyCode::Char(ch)));
+    }
+    chat.handle_key_event(KeyEvent::from(KeyCode::Enter));
+
+    let active = render_bottom_popup(&chat, 100);
+    assert!(active.contains("1/1 |"));
+    assert!(active.contains("n/p match"));
+
+    chat.handle_key_event(KeyEvent::from(KeyCode::Char('/')));
+    let restarted = render_bottom_popup(&chat, 100);
+    assert!(restarted.contains("Search: /"));
+    assert!(!restarted.contains("Search: /maintainers"));
+    assert!(!restarted.contains("1/1 |"));
+}
+
 #[tokio::test]
 async fn slash_help_esc_dismisses_popup() {
     let (mut chat, _rx, _op_rx) = make_chatwidget_manual(None).await;