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

[Patrice Dumas]

Follow-up Comment #4, bug #28359 (project texinfo):

The document needs a @documentencoding...

The issue is certainly also present in the perl implementation, but hopefully
can more easily be solved here.

One think I am not sure about, is what should the solution be? Suppose we can
extract the real string length, how should the rounding of the number of
underlining characters be done when it needs to?

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