indicating start and end of an overlay?

indicating start and end of an overlay?

[Drew Adams]

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Can anyone think of a way in Emacs, today, to visually indicate the start
and end of an overlay or a stretch of a face text property, as suggested by
the little red corners in the first attached image? Notice the part
highlighted in yellow, which shows two adjacent blue highlights. (This is
from http://graphics.csail.mit.edu/~rcm/chi04.pdf, which Herbert/Guanpeng
cited in his email today: "A prototype of intelligent replace for Emacs".)

IOW, how might one, today, indicate two adjacent overlays (or text-property
zones), so that a user can see the boundaries of each? Is this possible? If
not, how might Emacs be made to support this (after the release)?

Such "corners" would be useful. If it were not feasible to implement such a
feature, could we perhaps implement something similar using box faces with
borders? That is, could we have a way to make a bordered-box face show the
vertical border at each overlay beginning and end? See the second attached
image for what I mean.

Today, if I use a box face with a border, and I create an overlay from L to
M and another overlay from M+1 to N, then the appearance is the same as a
single overlay from L to N. It would be useful to be able to specify that
the two overlays each show their vertical borders at beginning and end. This
wouldn't be as clear as having corners, as in the first screenshot, but it
would still be useful.

WDOT?

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RE: indicating start and end of an overlay?

[Drew Adams]

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Got no reply about this. The recent thread "no good way to highlight
rectangle while region is highlighted" reminded me of this, for some reason.

> From: Drew Adams Sent: Sunday, April 29, 2007 10:59 AM
>
> Can anyone think of a way in Emacs, today, to visually indicate the start
> and end of an overlay or a stretch of a face text property, as
> suggested by
> the little red corners in the first attached image? Notice the part
> highlighted in yellow, which shows two adjacent blue highlights. (This is
> from http://graphics.csail.mit.edu/~rcm/chi04.pdf, which Herbert/Guanpeng
> cited in his email today: "A prototype of intelligent replace for Emacs".)
>
> IOW, how might one, today, indicate two adjacent overlays (or
> text-property
> zones), so that a user can see the boundaries of each? Is this
> possible? If
> not, how might Emacs be made to support this (after the release)?
>
> Such "corners" would be useful. If it were not feasible to
> implement such a
> feature, could we perhaps implement something similar using box faces with
> borders? That is, could we have a way to make a bordered-box face show the
> vertical border at each overlay beginning and end? See the second attached
> image for what I mean.
>
> Today, if I use a box face with a border, and I create an overlay
> from L to
> M and another overlay from M+1 to N, then the appearance is the same as a
> single overlay from L to N. It would be useful to be able to specify that
> the two overlays each show their vertical borders at beginning
> and end. This
> wouldn't be as clear as having corners, as in the first screenshot, but it
> would still be useful.
>
> WDOT?

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