From: Stefan Monnier <monnier@iro.umontreal.ca>
To: JD Smith <jdtsmith@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: cursor-intangible and rear-nonsticky t
Date: Mon, 05 Apr 2021 12:47:50 -0400 [thread overview]
Message-ID: <jwvmtucn0va.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <11A4C2D3-101E-4121-8DFD-D6451B28C8F1@gmail.com> (JD Smith's message of "Mon, 5 Apr 2021 11:26:58 -0400")
> 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.
> On MacOS ports, enabling `cursor-intangible-mode' causes the frame to
> aggressively regrab focus and re-raise when it loses focus. This makes
> it unusable.
That's very weird and clearly a bug.
Stefan
next prev parent reply other threads:[~2021-04-05 16:47 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 [this message]
2021-04-05 16:56 ` Stefan Monnier
2021-04-05 16:58 ` JD Smith
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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