IME candidates window blocks the game when player controling

While the player is controlling the character, the input may be detected as text input, causing the IME candidate window to blocks the game.

Steps(CN Pinyin IME as example):

1. Add Simplified Chinese in Settings, then press Win+Space to change the IME to CN Pinyin.

2. Keep the IME in Chinese mode (click the "中"/"英" to set it to "中" as in the video).

3. In-game, press the keys (e.g., WASD) to control the player character.

Expected result: If there is no text box, no IME candidate window on the screen.

Actual result: Even without text box, the candidate window still pops up and blocks the screen.