[BUG]Fcitx5：快速中文拼音输入有时会提前确认字符。Fcitx5: Fast Chinese Pinyin input occasionally commits characters prematurely

Bug description When using Fcitx5 pinyin input to enter Chinese characters on Linux, the input box in Chatbox sometimes enters an abnormal pre-editing state when entering pinyin quickly. For example, when entering "houzi", the input box should always remain in the pinyin candidate state until "猴子" is selected. However, occasionally, it becomes similar to "huzi", in which the letter o is not continued in the pre-editing area of Fcitx5, but is directly submitted to the input box in Chatbox, resulting in the subsequent pinyin being re-analyzed. This problem is especially obvious when entering quickly and continuously, and it is more difficult to reproduce when entering slowly.