Inserting an East Asian wide character into the middle of another one:

中国 ESC [ D 文:
中国文

xxx中文 ESC [ D 国:
xxx中文国

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

xxx[...]xxx中文xxx[...]xxx你好xESC [ 24 G 国:
xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国

xxx[...]xxx中文。xxx[...]xxx你好ESC [ 24 G 国:
xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国