Comment 6 for bug 656647

Expectations on the design of accents have diverged considerably in
different regions. Modern European users expect their acute and grave
accents to be wider, and shallower, than they traditionally were.

The problem then comes that simply doubling-up the accent becomes
physically impossible - there just isn't space over most characters. All
we can do is treat the double-accents as designs in their own right, and
do our best to make them as clear as they can be.

The set-up I'm proofing the fonts on has the double-accents looking
fine, so if others are seeing rasterization problems, we'd like to see
screenshots.

Dave