info: display of multibyte modeline is currently partially broken

[Andrey Borzenkov]

Texinfo 4.13 as shipped in Mandriva cooker.

Display of translated multibyte characters in modeline is currently 
broken. Screen size of displayed text is computed using plain strlen(); 
also when modeline needs to be truncated it is truncated on byte 
boundary instead of on (mb)character boundary. The effect is, in the 
best case tail of modeline simply displays garbage; in the worst case, 
resetting inverse display is lost so main window suddenly starts to be 
displayed inverse. I also have seen strange window corruption that can 
well be attributed to incorrect line break computation.

I am ready to test patch if some work in progress exists. Thank you!

-andrey

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