From: JD Smith <jdtsmith@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: cursor-intangible and rear-nonsticky t
Date: Mon, 5 Apr 2021 12:58:19 -0400 [thread overview]
Message-ID: <88226B26-38AF-4B02-9E5E-A333AC8E2CC4@gmail.com> (raw)
In-Reply-To: <jwvmtucn0va.fsf-monnier+emacs@gnu.org>
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> On Apr 5, 2021, at 12:47 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>
>> If '(rear-nonsticky t) is among the text properties, the
>> `pre-redisplay-functions' do not apparently get called, and so
>> 'cursor-intangible fails to function.
>
> I don't think that's really what happens. I suspect the issue comes
> from the difference between `get-pos-property` and `get-char-property`:
> positions (like `point`) are not placed on a character but between two
> characters. But text properties only apply to characters. So the
> properties that are "on a position" are based on what properties would
> a character inherit if it where inserted at that position.
>
> By default text properties are front-nonstick and rear-sticky, so
> basically a position gets its properties from the char right before it.
> But if you set (rear-nonsticky t), then you get no properties at all at
> that position.
>
> So, I suspect that you're applying (rear-nonsticky t) a bit too
> generously, e.g. to all the chars in the prompt rather than only to the
> last one.
Interesting, so `rear-nonsticky t` is rather powerful in suppressing text-properties within contiguous text.
I believe `comint-output-filter` is the one responsible for setting `rear-nonsticky t` across the entire prompt:
(let ((prompt-start (save-excursion (forward-line 0) (point)))
(inhibit-read-only t))
...
(add-text-properties prompt-start (point) '(rear-nonsticky t)))
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next prev parent reply other threads:[~2021-04-05 16:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 15:26 cursor-intangible and rear-nonsticky t JD Smith
2021-04-05 16:47 ` Stefan Monnier
2021-04-05 16:56 ` Stefan Monnier
2021-04-05 16:58 ` JD Smith [this message]
2021-04-05 17:01 ` Stefan Monnier
2021-04-05 18:02 ` JD Smith
2021-04-05 18:47 ` Stefan Monnier
2021-04-05 21:11 ` JD Smith
2021-04-05 21:30 ` Stefan Monnier
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