Fix presentation highlighting (among other issues) in beirc.
Fix presentation highlighting (among other issues) in beirc.

	* pango.lisp (text-style-ascent, text-style-descent): Compute
        dummy values from TEXT-SIZE instead of asking the font.

swflint/McCLIM,antifuchs/mcclim,antifuchs/mcclim,swflint/McCLIM,slyrus/mcclim,onixie/mcclim,onixie/mcclim,slyrus/mcclim,onixie/mcclim,swflint/McCLIM