East Asian wide characters with combining diacritics:

中文 [combining low line]:
中文̲

xxx中[combining low line]文:
xxx中̲文

Overwriting an East Asian wide character with combining diacritic with an East
Asian wide character without combining diacritic, in the middle of an 80-column
line with mixed narrow and wide chars:

xxx[...]xxx中文[combining low line]xxx[...]xxx你好ESC [ 23 G 国:
xxxxxxxxxxxxxxxxxxxx中文̲xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好[23G国

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

Overwriting an East Asian wide character with another one with a combining
diacritic, 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[combining low line]:
xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好[23G国̲

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

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

xxx[...]xxx中文xxx[...]xxx你好xESC [ 25 G 。[combining low line]:
xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x[25G。̲

xxx[...]xxx中y文xxx[...]xxx你好ESC [ 23 G ，[combining low line]:
xxxxxxxxxxxxxxxxxxxx中y文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好[23G，̲

Overwriting a narrow character with a combining diacritic with an East Asian
wide character, in the middle of an 80-column line with mixed narrow and
widechars:

xxxxxxxxàxxx[...]xxx中文xxx[...]xxx你好xESC [ 9 G 中:
xxxxxxxxàxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x[9G中

xxxxxxxxàxxx[...]xxx中文xxx[...]xxx你好xESC [ 8 G 中:
xxxxxxxxàxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x[8G中

Overwriting an East Asian wide character with combining diacritic with a narrow
character without combining diacritic, in the middle of an 80-column line with
mixed narrow and wide chars:

xxx[...]xxx中文[combining low line]xxx[...]xxx你好ESC [ 23 G y:
xxxxxxxxxxxxxxxxxxxx中文̲xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好[23Gy

xxx[...]xxx中文[combining low line]。xxx[...]xxx你好xESC [ 23 G y:
xxxxxxxxxxxxxxxxxxxx中文̲。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x[23Gy

