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bug#45054: 27.1; Can get point into the middle of a run of characters wi
From: |
Zack Weinberg |
Subject: |
bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec |
Date: |
Sat, 5 Dec 2020 15:00:30 -0500 |
On Sat, Dec 5, 2020 at 11:18 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > 1. Is this indeed a bug in Emacs?
>
> Probably a bug in adjust_point_for_property. Try your recipe after
> setting global-disable-point-adjustment non-nil.
No change, but set-variable doesn't recognize that variable (so I used
setq instead) Is this variable possibly only available in development
trunk and/or in an Emacs compiled with internal debugging enabled?
I'm using 27.1 as packaged by Debian, right now.
> > 2. Assuming it is, can you suggest a workaround? I’m hoping for a
> > viable solution within my code that’s compatible at least as far back
> > as Emacs 24.
>
> A workaround in Lisp? Try making the affected text, or some of it,
> invisible, i.e. give it the 'invisible' text property as well. (I
> didn't try to test this solution, so I cannot promise it will work.)
That makes the situation worse: with the mode enabled, I can separate
point from the visible cursor just by attempting to move the visible
cursor over the displayed ¶. Also, if the ¶ is at the beginning of a
line and point is at the end of that line, C-a moves only to after the
(invisible) 6. And redisplay gets screwed up if I delete one of the
invisible characters.
> > 3. I think it would be better UI if the C-d in the recipe deleted the
> > entire run of text that’s getting hidden (more generally, deletion
> > commands should behave as if the ¶ is really what’s in the buffer).
> > I can’t figure out how to implement that, can you suggest anything?
>
> Why can't you delete every character around point that has this
> special property?
I don't know how to do that. My best guess is this would be done in a
change hook, but I'm not sure of that, and I don't understand how to
write change hooks, either. Is there a good example or guide-level
documentation you could point me at?
zw
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Zack Weinberg, 2020/12/05
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Zack Weinberg, 2020/12/05
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Eli Zaretskii, 2020/12/05
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec,
Zack Weinberg <=
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Eli Zaretskii, 2020/12/05
- Message not available
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Zack Weinberg, 2020/12/05
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Eli Zaretskii, 2020/12/06
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Zack Weinberg, 2020/12/09
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Eli Zaretskii, 2020/12/09
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Zack Weinberg, 2020/12/09
- bug#45054: 27.1; Can get point into the middle of a run of characters with a replacing display spec, Eli Zaretskii, 2020/12/09