Alt+tab switching windows will make the input method abnormal

### Windows Terminal version

1.21.10351.0

### Windows build number

10.0.26100.3476

### Other Software

_No response_

### Steps to reproduce

1. The operating system language is Chinese and the input method is Microsoft Pinyin.
2. Open Windows Terminal
3. Switch to another application window
4. Use alt+tab to switch windows to go back to Windows Termianl.
5. Bug occurs, no matter what input method is used before, after returning to Windows Terminal, the input method will be forced to switch to Microsoft Pinyin.

### Expected Behavior

After using alt+tab to switch windows, the input method is not automatically switched

### Actual Behavior

_After using alt+tab to switch windows, the input method is automatically switched, but using mouse clicks to switch windows is normal_

Start by reproducing the issue on Windows with Microsoft Pinyin, comparing Alt+Tab activation with mouse-based window switching. Trace the Windows Terminal focus and input-method handling around window activation. Done means returning with Alt+Tab no longer forces Microsoft Pinyin, while normal input-method behavior remains intact.

Written by the indexing model from the issue text.