Re: Question about display engine

[martin rudalics]

> This can only work if we assume users will want the same attribute be
> extended or not irrespective of the face.  Such an assumption is not
> necessarily valid: users could want the hl-line face, for example, be
> always extended, regardless of its attributes, but would like at the
> same time not see other faces' :underline attribute extended.

Reiterating what I said elsewhere (and hoping not to bore anyone with
my ideas): With the face-based approach the user would have to set
background, underline and extend for the highlight face to get that
behavior.  With the attributes-based approach, a user would have to
include highlight both in 'extend-background' and 'extend-underline'.

martin