unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: martin rudalics <rudalics@gmx.at>
Cc: Eli Zaretskii <eliz@gnu.org>, dancol@dancol.org, emacs-devel@gnu.org
Subject: Re: Can we make set_point_both less expensive?
Date: Fri, 20 Mar 2015 10:14:11 -0400	[thread overview]
Message-ID: <jwvfv8zzrxn.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <550BD579.9040804@gmx.at> (martin rudalics's message of "Fri, 20 Mar 2015 09:08:25 +0100")

> By not running the same hook twice (AFAIAC a bad interaction is only one
> where the function and redisplay try forever to annihilate each other's
> actions).

For me, a bad interaction is one where p-r-f followed by redisplay
followed by p-r-f followed by redisplay doesn't give the right answer.

But with something like `cursor-intangible', there will surely be cases
where that can happen.  E.g. imagine you scroll to a part of the buffer
that's got a cursor-intangible element: redisplay will move point to
a visible (and intangible) part of the buffer, then run p-r-f which
moves point outside of the window, after which redisplay has two
choices: either it decides to scroll to where point is (which would be
wrong, since we've just scrolled so we should move point rather than
scroll), or it moves point back into the intangible element.

> Although one problem of `pre-redisplay-function' is that for my taste
> it already runs a bit too often, for example, whenever we blink
> the cursor.

I agree that running it for cursor blinking is a misfeature.

> But wouldn't we then have to change the signature of functions on
> `pre-redisplay-function'?

Yup.

> In any case, I don't know yet about the major
> use cases you have in mind.

Implement a new `cursor-intangible' property, by having p-r-f move point
away from text with that property.


        Stefan



  reply	other threads:[~2015-03-20 14:14 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-15 19:53 Can we make set_point_both less expensive? Daniel Colascione
2015-03-16  3:02 ` Stefan Monnier
2015-03-16  3:32   ` Daniel Colascione
2015-03-16 12:49     ` Stefan Monnier
2015-03-16 16:24       ` Eli Zaretskii
2015-03-16 17:42         ` Stefan Monnier
2015-03-16 18:03         ` Artur Malabarba
2015-03-16  3:48   ` Eli Zaretskii
2015-03-16 12:47     ` Stefan Monnier
2015-03-16 16:23       ` Eli Zaretskii
2015-03-16 17:36         ` Stefan Monnier
2015-03-16 18:05           ` Eli Zaretskii
2015-03-16 18:18             ` Daniel Colascione
2015-03-16 18:27               ` Eli Zaretskii
2015-03-16 18:31                 ` Daniel Colascione
2015-03-16 19:42                   ` Eli Zaretskii
2015-03-16 20:43                     ` Daniel Colascione
2015-03-16 20:48                       ` Lennart Borgman
2015-03-16 20:53                         ` Daniel Colascione
2015-03-16 22:00                           ` Stefan Monnier
2015-03-17  7:08                       ` Eli Zaretskii
     [not found]                     ` <<5507408D.1040104@dancol.org>
     [not found]                       ` <<83h9tkyucg.fsf@gnu.org>
2015-03-17 15:11                         ` Drew Adams
2015-03-16 18:57             ` Stefan Monnier
2015-03-17 10:25               ` martin rudalics
2015-03-17 15:38                 ` Stefan Monnier
2015-03-17 19:27                   ` martin rudalics
2015-03-17 21:37                     ` Stefan Monnier
2015-03-18  7:36                       ` martin rudalics
2015-03-18 12:55                         ` Stefan Monnier
2015-03-18 19:05                           ` martin rudalics
2015-03-18 19:24                             ` Stefan Monnier
2015-03-19  7:51                               ` martin rudalics
2015-03-19 13:41                                 ` Stefan Monnier
2015-03-20  8:08                                   ` martin rudalics
2015-03-20 14:14                                     ` Stefan Monnier [this message]
2015-03-20 14:20                                       ` Lennart Borgman
2015-03-20 14:32                                       ` Eli Zaretskii
2015-03-20 14:48                                       ` martin rudalics
2015-03-20 15:08                                         ` Eli Zaretskii
2015-03-20 17:57                                           ` Stefan Monnier
2015-03-20 20:52                                             ` Eli Zaretskii
2015-03-20 21:50                                               ` Stefan Monnier
2015-03-21  7:32                                                 ` Eli Zaretskii
2015-03-21  9:58                                                   ` martin rudalics
2015-03-21 10:43                                                     ` Eli Zaretskii
2015-03-21 12:30                                                       ` martin rudalics
2015-03-21 12:45                                                         ` Eli Zaretskii
2015-03-20 19:53                                           ` martin rudalics
2015-03-20 21:19                                             ` Eli Zaretskii
2015-03-20 21:53                                               ` Stefan Monnier
2015-03-21  7:38                                                 ` Eli Zaretskii
2015-03-21  9:59                                                   ` martin rudalics
2015-03-21 10:46                                                     ` Eli Zaretskii
2015-03-21 10:56                                                       ` Eli Zaretskii
2015-03-21 12:31                                                       ` martin rudalics
2015-03-21 14:03                                                       ` Stefan Monnier
2015-03-21 14:44                                                         ` Eli Zaretskii
2015-03-21 17:28                                                           ` Stefan Monnier
2015-03-21 18:28                                                             ` Eli Zaretskii
2015-03-21 22:14                                                               ` Stefan Monnier
2015-03-22 14:11                                                                 ` martin rudalics
2015-03-22 22:25                                                                   ` Stefan Monnier
2015-03-21 13:59                                                   ` Stefan Monnier
2015-03-21 14:35                                                     ` Stefan Monnier
2015-03-21 14:47                                                       ` Eli Zaretskii
2015-03-21 17:10                                                         ` Stefan Monnier
2015-03-21 17:14                                                           ` Eli Zaretskii
2015-03-21 22:12                                                             ` Stefan Monnier
2015-03-22  3:34                                                               ` Eli Zaretskii
2015-03-22 13:58                                                                 ` Stefan Monnier
2015-03-22 17:41                                                                   ` Eli Zaretskii
2015-03-22 22:23                                                                     ` Stefan Monnier
2015-03-23 15:31                                                                       ` Eli Zaretskii
2015-03-23 19:27                                                                         ` Stefan Monnier
2015-03-23 19:28                                                                         ` Stefan Monnier
2015-03-23 19:39                                                                           ` Eli Zaretskii
2015-03-23 21:37                                                                             ` Stefan Monnier
2015-03-21 14:42                                                     ` Eli Zaretskii
2015-03-21  9:58                                                 ` martin rudalics
2015-03-21 14:10                                                   ` Stefan Monnier
2015-03-21  9:58                                               ` martin rudalics
2015-03-21 10:42                                                 ` Eli Zaretskii
2015-03-21 12:30                                                   ` martin rudalics
2015-03-21 12:45                                                     ` Eli Zaretskii
2015-03-20 17:59                                         ` Stefan Monnier
2015-03-20 19:53                                           ` martin rudalics
2015-03-17 14:29       ` Richard Stallman
2015-03-17 15:15         ` Yuri Khan
2015-03-17 15:33           ` Eli Zaretskii
2015-03-18 12:00           ` Richard Stallman

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=jwvfv8zzrxn.fsf-monnier+emacs@gnu.org \
    --to=monnier@iro.umontreal.ca \
    --cc=dancol@dancol.org \
    --cc=eliz@gnu.org \
    --cc=emacs-devel@gnu.org \
    --cc=rudalics@gmx.at \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).