Carlos
set memowidth changes the way that mline and memlines work (among others) it does not matter the font you are using for example:
cString='12345678901234567890'
? memlines(cString) --> 1
set memowidth to 10
? memlines(cString) --> 2
But the scope is limited to de current datasession, so may be that is your problem.
Hugo
(I tried to answer to your e-mail in spanish but it bounced)
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges