> And since the property list of the three images are fully identical
> (the same cons cell), the second and third images (intervals) which
> are adjacent to the first image (interval), are skipped by
> Fnext_property_change.
> I understand why the interval code does this for ordinary text
> properties, but it obviously breaks for the display property.
The problem is that text-properties are not really adapted for such uses.
After all, they apply to chars, not to text. So by convention we consider
that contiguous properties that are `eq' make up a region/area/extent, which
works 99%. For corner cases like yours, you have to work around the problem
by making sure your `cons' cells are not `eq'.
Another alternative is to use overlays. Except that overlays are not
duplicable and don't apply to strings. That's where XEmacs's extents
make sense.
Stefan
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