Fix issue with text width in font-text-extents.
Fix issue with text width in font-text-extents.

paths-from-string in prim-text.lisp computes the next character position (offset) using the maximum of font-glyph-right and font-glyph-width. font-text-extents only used font-glyph-width to compute the text string width. This lead to the  text size being incorrect for some fonts, especially italic fonts where the width and right can be different.

slyrus/mcclim,slyrus/mcclim