Avoid triggering refreshStatic unless there really is a banner to display. (#14328)

packages/cli/src/ui/AppContainer.test.tsx

@@ -73,6 +73,7 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
     disableMouseEvents: vi.fn(),
   };
 });
+import ansiEscapes from 'ansi-escapes';
 import type { LoadedSettings } from '../config/settings.js';
 import type { InitializationResult } from '../core/initializer.js';
 import { useQuotaAndFallback } from './hooks/useQuotaAndFallback.js';
@@ -1915,4 +1916,35 @@ describe('AppContainer State Management', () => {
       unmount();
     });
   });
+
+  describe('Regression Tests', () => {
+    it('does not refresh static on startup if banner text is empty', async () => {
+      // Mock banner text to be empty strings
+      vi.spyOn(mockConfig, 'getBannerTextNoCapacityIssues').mockResolvedValue(
+        '',
+      );
+      vi.spyOn(mockConfig, 'getBannerTextCapacityIssues').mockResolvedValue('');
+
+      // Clear previous calls
+      mocks.mockStdout.write.mockClear();
+
+      const { unmount } = renderAppContainer();
+
+      // Allow async effects to run
+      await waitFor(() => expect(capturedUIState).toBeTruthy());
+
+      // Wait for fetchBannerTexts to complete
+      await act(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 100));
+      });
+
+      // Check that clearTerminal was NOT written to stdout
+      const clearTerminalCalls = mocks.mockStdout.write.mock.calls.filter(
+        (call: unknown[]) => call[0] === ansiEscapes.clearTerminal,
+      );
+
+      expect(clearTerminalCalls).toHaveLength(0);
+      unmount();
+    });
+  });
 });

packages/cli/src/ui/AppContainer.tsx

@@ -125,6 +125,7 @@ import { useSettings } from './contexts/SettingsContext.js';
 import { enableSupportedProtocol } from './utils/kittyProtocolDetector.js';
 import { useInputHistoryStore } from './hooks/useInputHistoryStore.js';
 import { enableBracketedPaste } from './utils/bracketedPaste.js';
+import { useBanner } from './hooks/useBanner.js';
 
 const WARNING_PROMPT_DURATION_MS = 1000;
 const QUEUE_ERROR_DISPLAY_DURATION_MS = 3000;
@@ -203,6 +204,16 @@ export const AppContainer = (props: AppContainerProps) => {
   const [warningBannerText, setWarningBannerText] = useState('');
   const [bannerVisible, setBannerVisible] = useState(true);
 
+  const bannerData = useMemo(
+    () => ({
+      defaultText: defaultBannerText,
+      warningText: warningBannerText,
+    }),
+    [defaultBannerText, warningBannerText],
+  );
+
+  const { bannerText } = useBanner(bannerData, config);
+
   const extensionManager = config.getExtensionLoader() as ExtensionManager;
   // We are in the interactive CLI, update how we request consent and settings.
   extensionManager.setRequestConsent((description) =>
@@ -380,6 +391,7 @@ export const AppContainer = (props: AppContainerProps) => {
     }
     setHistoryRemountKey((prev) => prev + 1);
   }, [setHistoryRemountKey, isAlternateBuffer, stdout]);
+
   const handleEditorClose = useCallback(() => {
     if (
       shouldEnterAlternateScreen(isAlternateBuffer, config.getScreenReader())
@@ -403,6 +415,18 @@ export const AppContainer = (props: AppContainerProps) => {
     };
   }, [handleEditorClose]);
 
+  useEffect(() => {
+    if (
+      !(settings.merged.ui?.hideBanner || config.getScreenReader()) &&
+      bannerVisible &&
+      bannerText
+    ) {
+      // The header should show a banner but the Header is rendered in static
+      // so we must trigger a static refresh for it to be visible.
+      refreshStatic();
+    }
+  }, [bannerVisible, bannerText, settings, config, refreshStatic]);
+
   const {
     isThemeDialogOpen,
     openThemeDialog,
@@ -1388,7 +1412,6 @@ Logging in with Google... Restarting Gemini CLI to continue.
         setDefaultBannerText(defaultBanner);
         setWarningBannerText(warningBanner);
         setBannerVisible(true);
-        refreshStatic();
         const authType = config.getContentGeneratorConfig()?.authType;
         if (
           authType === AuthType.USE_GEMINI ||
@@ -1497,10 +1520,7 @@ Logging in with Google... Restarting Gemini CLI to continue.
       customDialog,
       copyModeEnabled,
       warningMessage,
-      bannerData: {
-        defaultText: defaultBannerText,
-        warningText: warningBannerText,
-      },
+      bannerData,
       bannerVisible,
     }),
     [
@@ -1591,8 +1611,7 @@ Logging in with Google... Restarting Gemini CLI to continue.
       authState,
       copyModeEnabled,
       warningMessage,
-      defaultBannerText,
-      warningBannerText,
+      bannerData,
       bannerVisible,
     ],
   );