Fix/windows pty crash (#12587)

Co-authored-by: LayorX <yor31117@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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

@@ -1709,4 +1709,41 @@ describe('AppContainer State Management', () => {
       unmount();
     });
   });
+
+  describe('Shell Interaction', () => {
+    it('should not crash if resizing the pty fails', async () => {
+      const resizePtySpy = vi
+        .spyOn(ShellExecutionService, 'resizePty')
+        .mockImplementation(() => {
+          throw new Error('Cannot resize a pty that has already exited');
+        });
+
+      mockedUseGeminiStream.mockReturnValue({
+        streamingState: 'idle',
+        submitQuery: vi.fn(),
+        initError: null,
+        pendingHistoryItems: [],
+        thought: null,
+        cancelOngoingRequest: vi.fn(),
+        activePtyId: 'some-pty-id', // Make sure activePtyId is set
+      });
+
+      // The main assertion is that the render does not throw.
+      const { unmount } = render(
+        <AppContainer
+          config={mockConfig}
+          settings={mockSettings}
+          version="1.0.0"
+          initializationResult={mockInitResult}
+        />,
+      );
+
+      await act(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 0));
+      });
+
+      expect(resizePtySpy).toHaveBeenCalled();
+      unmount();
+    });
+  });
 });

packages/cli/src/ui/AppContainer.tsx

@@ -805,11 +805,27 @@ Logging in with Google... Please restart Gemini CLI to continue.
 
   useEffect(() => {
     if (activePtyId) {
-      ShellExecutionService.resizePty(
-        activePtyId,
-        Math.floor(terminalWidth * SHELL_WIDTH_FRACTION),
-        Math.max(Math.floor(availableTerminalHeight - SHELL_HEIGHT_PADDING), 1),
-      );
+      try {
+        ShellExecutionService.resizePty(
+          activePtyId,
+          Math.floor(terminalWidth * SHELL_WIDTH_FRACTION),
+          Math.max(
+            Math.floor(availableTerminalHeight - SHELL_HEIGHT_PADDING),
+            1,
+          ),
+        );
+      } catch (e) {
+        // This can happen in a race condition where the pty exits
+        // right before we try to resize it.
+        if (
+          !(
+            e instanceof Error &&
+            e.message.includes('Cannot resize a pty that has already exited')
+          )
+        ) {
+          throw e;
+        }
+      }
     }
   }, [terminalWidth, availableTerminalHeight, activePtyId]);