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From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Eli Zaretskii <eliz@gnu.org>
Cc: rudalics@gmx.at, dancol@dancol.org, emacs-devel@gnu.org
Subject: Re: Can we make set_point_both less expensive?
Date: Sat, 21 Mar 2015 09:59:35 -0400	[thread overview]
Message-ID: <jwv1tkitq0r.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <83a8z6vlyn.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 21 Mar 2015 09:38:56 +0200")

>> > discussed.  Stefan wants redisplay to move point also in the case
>> > where some Lisp moved point and entered a region of buffer positions
>> > that has a certain text property.
>> Yes and no: I want pre-redisplay-function to do that.
> This will only work if pre-redisplay-function is called in a way that
> guarantees it will catch the position of point after the previous
> command.

I think I don't understand what you're saying:
pre-redisplay-function is called at the beginning of redisplay, so of
course it's called "after the previous command".

> Another, related, requirement is that we never call
> pre-redisplay-function when point is in a position that is not
> supposed to be visible by the user.

Again I don't understand.  pre-redisplay-function will be called at the
beginning of every redisplay, so it can't assume anything about where
point is.  On the contrary, it's pre-redisplay-function which would be
in charge of changing point (if needed) to take `cursor-intangible'
into account.

> Overall, it sounds like a non-trivial deviation from the original
> purpose of pre-redisplay-function, as I understand it.

I assure you it isn't: `cursor-intangible' was very much in my mind
while I was implementing this new feature.

> What I _am_ saying is that only redisplay, in its last part, knows
> where the cursor will be positioned.

Of course: pre-redisplay-function only has control of `point', not over
the cursor.  So it should move point away from the `cursor-intangible'
property.  The difference between point and the place where the cursor
is drawn on screen is not really relevant to `cursor-intangible'.


        Stefan



  parent reply	other threads:[~2015-03-21 13:59 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
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 [this message]
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

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