Overwriting an East Asian wide character with another one:

中国 ESC [ 2 D 文:
中国文

xxx中文 ESC [ 2 D 国:
xxx中文国

Overwriting an East Asian wide character with another one, in the middle of
an 80-column line with mixed narrow and wide chars:

xxx[...]xxx中文xxx[...]xxx你好ESC [ 23 G 国:
xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国

xxx[...]xxx中文。xxx[...]xxx你好xESC [ 23 G 国:
xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国