Adding font groups to font chooser

[Craig Drummond]

> The implementation of using an extra column is one that I think is too
> simplistic and not effective. The tree structure as shows in the solution
> looks a lot more effective and I'd rather see the second part (the visual
> representation) implemented like that.

But would this not be more applicable to the font combo? The font selector 
already has separate columns for family, style, and size. Making the family 
column into a treeview sounds a little odd.

Craig.