GNU bug report logs - #31067
27.0.50; After-string hidden by subsequent invisible text

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Message #35 received at 31067 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Eli Zaretskii <eliz <at> gnu.org>, Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31067 <at> debbugs.gnu.org
Subject: RE: bug#31067: 27.0.50; After-string hidden by subsequent invisible
 text
Date: Fri, 6 Apr 2018 15:39:45 +0000 (UTC)

> You are talking about "covering" here, and I think this discloses the
> mental bias in understanding how before- and after-strings work.
> Unlike most other overlay properties, they do not supply any
> attributes to the characters "covered" by the overlay.  Instead, they
> have effect only at two places: the beginning and the end points of
> the overlay.  Consequently, we check for them only when we are about
> to display something at these two positions.  And in this case, the
> end point is invisible, so we never check any after-strings there.

Sounds like that information is important for a user's mental
model.  Is it presented in the manual?  If not, perhaps it
should be.

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