It seems that it does not support Chinese character in edit field.
Maybe because of the input method of Chinese, as we key in 'wen' first,, the edit field will appear 'wen' with underline, then we pick one Chinese character from the list, and then the right Chinese character would show up in the edit field.
Lazarus seems like that it does not support this kind of input method,so when we key in 'wen', the 'wen' will be right here, we can't pick Chinese character any more.
Maybe it's the reason that Lazarus treat a string by character one by one, if it can treat a string just like a string, it will be better.