Re: Font slants

[Chong Yidong]

Stefan Monnier <address@hidden> writes:

>> one possibility is to change font-slant-table etc into defconsts and
>> move them from faces.el into cus-face.el.  Is it even useful to
>> customize these alists?
>
> ...
>
>> (defcustom font-swidth-table
>>   '((ultracondensed . 50) (ultra-condensed . 51)
>>   ...
>
>> Why do we have a practically indistinguishable difference between
>> ultracondensed and ultra-condensed?  Similarly with several other
>> symbols in these alists.
>
> Try to change it (or check vc-annotate) to see why: it needs to be
> bijective (ie. reversible).

This is another reason why these alists should be constants instead of
customizable, IMO.  As defcustoms, it would seem reasonable for the user
to provide arbitrary values for these alists.