fix(cli): correct alternate buffer warning logic for JetBrains (#26067)

packages/cli/src/gemini.tsx

@@ -85,7 +85,6 @@ import { relaunchOnExitCode } from './utils/relaunch.js';
 import { loadSandboxConfig } from './config/sandboxConfig.js';
 import { deleteSession, listSessions } from './utils/sessions.js';
 import { createPolicyUpdater } from './config/policy.js';
-import { isAlternateBufferEnabled } from './ui/hooks/useAlternateBuffer.js';
 
 import { setupTerminalAndTheme } from './utils/terminalTheme.js';
 import { runDeferredCommand } from './deferred.js';
@@ -644,7 +643,7 @@ export async function main() {
 
     let input = config.getQuestion();
     const useAlternateBuffer = shouldEnterAlternateScreen(
-      isAlternateBufferEnabled(config),
+      config.getUseAlternateBuffer(),
       config.getScreenReader(),
     );
     const rawStartupWarnings = await rawStartupWarningsPromise;

packages/cli/src/utils/userStartupWarnings.test.ts

@@ -220,5 +220,22 @@ describe('getUserStartupWarnings', () => {
       );
       expect(warnings).not.toContainEqual(compWarning);
     });
+
+    it('should correctly pass isAlternateBuffer option to getCompatibilityWarnings', async () => {
+      const projectDir = path.join(testRootDir, 'project-alt');
+      await fs.mkdir(projectDir);
+
+      await getUserStartupWarnings({}, projectDir, { isAlternateBuffer: true });
+      expect(getCompatibilityWarnings).toHaveBeenCalledWith({
+        isAlternateBuffer: true,
+      });
+
+      await getUserStartupWarnings({}, projectDir, {
+        isAlternateBuffer: false,
+      });
+      expect(getCompatibilityWarnings).toHaveBeenCalledWith({
+        isAlternateBuffer: false,
+      });
+    });
   });
 });