Enter key sends message instead of dismissing IME candidate box

[bobleer]

Problem Description

On macOS, when using a Chinese input method (such as Sogou Input, Tencent Input, or system default Chinese IME), pressing Enter while the candidate box is still visible will send the message immediately, instead of just closing/dismissing the candidate box as expected.

Expected Behavior

When the Chinese IME candidate box is visible, pressing Enter should dismiss the candidate box without sending the message. The message should only be sent after the candidate box is closed.

Actual Behavior

Pressing Enter while the candidate box is visible sends the message immediately, even though the user has not finished composing.

Steps to Reproduce

1. Open a chat window or any text input field on macOS
2. Switch to Chinese input method
3. Start typing to bring up the candidate box
4. Without closing the candidate box, press Enter
5. The message is sent while the candidate box is still visible