We currently shrink Sans and Serif fonts to 90% for experimental Condensed fonts.
The OpenType specifies several usWidthClass (see
http://www.microsoft.com/typography/otspec/os2.htm#wdc ) of which Condensed (3)
is 75% aspect ratio of Normal (5) and Semi-condensed (4) is 87.5%, i.e. closest
to 90%, aspect ratio of Normal.
To follow the naming of the OT specs our current 90% Condensed should be renamed
Semi-condensed. This might be unnecessary or even negative for users currently
using it, even if experimental. However the earlier the better.
The current usWidthClass is 5 which is Normal. For a Condensed font it should be
3 and for a Semi-condensed it should be 4. This must be fixed.
NameID=16 could be set so smart applications can put DejaVu Condensed in the
same family as DejaVu fonts but that's another bug.