GNU bug report logs - #65896
30.0.50; folding text with text properties prevents background from extending past the newline

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Message #112 received at 65896 <at> debbugs.gnu.org (full text, mbox):

From: StrawberryTea <look <at> strawberrytea.xyz>
To: Juri Linkov <juri <at> linkov.net>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 65896 <at> debbugs.gnu.org,
 Ihor Radchenko <yantar92 <at> posteo.net>,
 Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
Subject: Re: bug#65896: 30.0.50; folding text with text properties prevents
 background from extending past the newline
Date: Fri, 29 Sep 2023 14:07:17 -0500

[Message part 1 (text/plain, inline)]

Basically, it’s always possible to overlay the newline after a fold or shorten
the fold by one character and overlay a newline for the last character then set
a face and extend property for that newline. But even with this, when the last
character in the buffer is not a newline and has the extend property, its face
is not extended and there is no character after to coerce into a newline.

What I think could be an alternative to adding all these overlays is a change on
the display engine side so that the extend property on a character extends its
face background regardless of whether it’s a newline character.

Juri Linkov <juri <at> linkov.net> writes:

>>> I tried, but the conclusion was that this requires changes in the display engine.
>>
>> Could you expand on what exactly you tried, and what limitations you
>> faced?  (Apologies if you went over this somewhere else and I missed it)
>
> Sorry, I don’t remember the details, have to reread previous threads,
> maybe this is already possible without changes in the display engine.

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