[bug #28359] matchtitle underscore width not with the title when title contain wide char

[Changyuan Yu]

Follow-up Comment #5, bug #28359 (project texinfo):

sorry for missing @documentencoding, the sample is in UTF-8, it's better to
add "@documentencoding UTF-8" to it.

The underlining character always has the length of 1, the number of
underlining characters should be equal to the length of the string above it.
When `cat' the raw info file in terminal, we can see the string and its
underlining decoration aligned at both side.

Or we can just ignore this issue, string and its underlining decoration not
aligned is not a big problem when view the info file in terminal. When view in
emacs, we can modify info.el, use `string-bytes' instead of `string-length'(or
better, use both) in function  `Info-fontify-node'.

and some reference for CJK character width:
http://unicode.org/reports/tr11/


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