commit: speed up fp_TextRun::recalcWidth()

[Tomas Frydrych]

Separating the calculations of the two widths into two distinct loops 
reduced the more than 1,000,000 calls to gr_Graphics::setFont() in 
my 45 page test doc to 'mere' 63,000. This should make noticeable 
difference to performance.

Tomas