Received: (at 23098) by debbugs.gnu.org; 28 Mar 2016 18:00:10 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Mar 28 14:00:10 2016 Received: from localhost ([127.0.0.1]:42345 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1akbSU-0003f0-7v for submit <at> debbugs.gnu.org; Mon, 28 Mar 2016 14:00:10 -0400 Received: from eggs.gnu.org ([208.118.235.92]:40225) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1akbSS-0003dx-0K for 23098 <at> debbugs.gnu.org; Mon, 28 Mar 2016 14:00:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1akbSJ-0003tv-H6 for 23098 <at> debbugs.gnu.org; Mon, 28 Mar 2016 14:00:02 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-0.2 required=5.0 tests=BAYES_50,RP_MATCHES_RCVD autolearn=disabled version=3.3.2 Received: from fencepost.gnu.org ([2001:4830:134:3::e]:59136) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1akbSJ-0003tr-DL; Mon, 28 Mar 2016 13:59:59 -0400 Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4856 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1akbSI-00029I-LY; Mon, 28 Mar 2016 13:59:59 -0400 Date: Mon, 28 Mar 2016 20:59:39 +0300 Message-Id: <838u12xz3o.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Jorgen =?utf-8?Q?Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> In-reply-to: <CALqDrSdQ184QTf6KMW4ueROFawUrR_Y1VSD8b-XB3zkW+7LYzA@HIDDEN> (message from Jorgen =?utf-8?Q?Sch=C3=A4fer?= on Mon, 28 Mar 2016 17:41:02 +0000) Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <m2r3ewstu0.fsf@HIDDEN> <CALqDrSfJvTeBWrQ9bv9jHn97MNHSSgK7muO+zhz6Ky3ZqPOZXA@HIDDEN> <83bn5yy0jw.fsf@HIDDEN> <CALqDrSdQ184QTf6KMW4ueROFawUrR_Y1VSD8b-XB3zkW+7LYzA@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-Spam-Score: -6.0 (------) X-Debbugs-Envelope-To: 23098 Cc: jwiegley@HIDDEN, 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: Eli Zaretskii <eliz@HIDDEN> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -6.0 (------) > From: Jorgen Schäfer <jorgen.schaefer@HIDDEN> > Date: Mon, 28 Mar 2016 17:41:02 +0000 > Cc: jwiegley@HIDDEN, 23098 <at> debbugs.gnu.org > > I actually don't understand why you don't want to set > scroll-conservatively globally. From what you say, it sounds like > that variable is exactly what you want, and not only in this > situation. Can you explain why you don't see that as a solution? > > When scrolling through the buffer with cursor-up/cursor-down, I want full-page scroll, not single-line scroll. Emacs doesn't by default give you a full-page scroll, it recenters point instead. > These two situations have absolutely nothing to do with each other as far as the user experience is > concerned. The reason why the two interact is purely technical and an artifact of how Emacs works > underneath. No, the reason is not technical. This was coded specifically for those who do want minimal scroll to bring point into view. They explicitly requested this behavior. > I'd welcome patches to try to fix this, but I think the best fix is > inside 'recenter': it should detect this situation and behave as if > its argument was modified so as not to request redisplay of the window > with window-start point that will cause recentering of point. > > Yes, for example. Great idea. > > Interested? > > No, thank you. Well, I hope someone else will be.
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 28 Mar 2016 17:41:20 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Mar 28 13:41:20 2016 Received: from localhost ([127.0.0.1]:42328 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1akbAF-00038S-Mu for submit <at> debbugs.gnu.org; Mon, 28 Mar 2016 13:41:19 -0400 Received: from mail-lf0-f46.google.com ([209.85.215.46]:35372) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <jorgen.schaefer@HIDDEN>) id 1akbAE-00038E-1w for 23098 <at> debbugs.gnu.org; Mon, 28 Mar 2016 13:41:18 -0400 Received: by mail-lf0-f46.google.com with SMTP id k79so15711994lfb.2 for <23098 <at> debbugs.gnu.org>; Mon, 28 Mar 2016 10:41:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=gX7OAYUxzGKEHPabLpSUFCSx8dCT3yU/s6A9iehuj0g=; b=NUKjBnfr59AdlTgNIZcWuSeKiPyvJdoT1STnsYKr1wfS38kje/j/hOg5AuSo0cBscm X+yc/5pEK4eRP1PRj4VlRdFWUh/isaRvCyBBW1/u7/LSDNfb7ua6Gfd/3bCSkmclzKaj MnSa7MrBANCmz5buzekvAU6COY0B+a4v4LFG5qlYhJ0n5LmxWqhYM5iPsRU42dl/83k0 VwFbWXwIlq2qEjI4EfHbrhTmbRkVf/S/kwscYyvyZG1do5t0yvPQm+adYE/4VgPCQ19N Uk37qlD0eH0wLUwSCxhcrafvP7IDQsMx+AUKwcGhSbVpMTOyhT79tTd3g6oKnJI7etgs LMYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=gX7OAYUxzGKEHPabLpSUFCSx8dCT3yU/s6A9iehuj0g=; b=PJ1jrYLAWh+vPTjR6bsx7IMsxPpBxF11miaIOktivOij2nZ7yeklX1l7pcIhw97OLz zdcwM87IHWwp0umKJSIZ4/NqKubmqm+dPq9KrLki3Hit5C+Qa9y0fT9VMdnHKPae3cnJ zqIFsJwtPxlUg1uiK5+Au/FuoFhePhLxi7c3CmbzA+lXGezFiXaZdPdXUYfd2WWHJqGd 5IIGClzIL6lJOwflmE7Vjz4HCyraeHmcspLvvCP0BaoyEjAthTP7Eh8yxqY5D61yH+np VBIg3OjPLAGjJ6dsz+yZ3MEN+3N6PXfKPPlsYMo8pG4XjmOTOX0IsGLjnnXDkf7SVGtI F/Kg== X-Gm-Message-State: AD7BkJKDnoqZsCkQq66CK82KvpEgTdjBfvVG+xf+M94Z9V/rM2IByyg8/GZXIEJ78ANCzFffWHCm7d/FZQFViA== X-Received: by 10.25.154.65 with SMTP id c62mr11418700lfe.54.1459186872039; Mon, 28 Mar 2016 10:41:12 -0700 (PDT) MIME-Version: 1.0 References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <m2r3ewstu0.fsf@HIDDEN> <CALqDrSfJvTeBWrQ9bv9jHn97MNHSSgK7muO+zhz6Ky3ZqPOZXA@HIDDEN> <83bn5yy0jw.fsf@HIDDEN> In-Reply-To: <83bn5yy0jw.fsf@HIDDEN> From: =?UTF-8?Q?Jorgen_Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> Date: Mon, 28 Mar 2016 17:41:02 +0000 Message-ID: <CALqDrSdQ184QTf6KMW4ueROFawUrR_Y1VSD8b-XB3zkW+7LYzA@HIDDEN> Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window To: Eli Zaretskii <eliz@HIDDEN> Content-Type: multipart/alternative; boundary=001a114012b42b3d7d052f1f6b66 X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 23098 Cc: jwiegley@HIDDEN, 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) --001a114012b42b3d7d052f1f6b66 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Mon, Mar 28, 2016 at 7:29 PM Eli Zaretskii <eliz@HIDDEN> wrote: > > From: Jorgen Sch=C3=A4fer <jorgen.schaefer@HIDDEN> > > Date: Mon, 28 Mar 2016 13:10:23 +0000 > > Cc: 23098 <at> debbugs.gnu.org > > > > As an end user, I expect `recenter-to-bottom' to cycle the line with > point on it between the top, middle and > > bottom of the current window. The problem described in this report mean= s > that Emacs does not actually do > > this =E2=80=93 the line with point on it does not ever go even near the= bottom > of the window. > > You are judging what Emacs does by the end result: since the result is > not to have point near the bottom, you deduce that Emacs didn't even > try. > No, I am not. As I explained at length in my last mail. I actually don't understand why you don't want to set > scroll-conservatively globally. From what you say, it sounds like > that variable is exactly what you want, and not only in this > situation. Can you explain why you don't see that as a solution? > When scrolling through the buffer with cursor-up/cursor-down, I want full-page scroll, not single-line scroll. When I hit C-l, I want point to end up at the bottom at the window. I do not want to lose the former just so I can have the latter. And, as the programmer of a mode who tries to keep text at the bottom of the window, I most certainly do not want to prescribe to the user how their scrolling with cursor-up/cursor-down behaves just so I can keep the text at the bottom of the window when I add a line. These two situations have absolutely nothing to do with each other as far as the user experience is concerned. The reason why the two interact is purely technical and an artifact of how Emacs works underneath. I'd welcome patches to try to fix this, but I think the best fix is > inside 'recenter': it should detect this situation and behave as if > its argument was modified so as not to request redisplay of the window > with window-start point that will cause recentering of point. Yes, for example. Great idea. > Interested? > No, thank you. Regards, Jorgen --001a114012b42b3d7d052f1f6b66 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Mar 28= , 2016 at 7:29 PM Eli Zaretskii <<a href=3D"mailto:eliz@HIDDEN">eliz@gn= u.org</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma= rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">> From: Jor= gen Sch=C3=A4fer <<a href=3D"mailto:jorgen.schaefer@HIDDEN" target=3D= "_blank">jorgen.schaefer@HIDDEN</a>><br> > Date: Mon, 28 Mar 2016 13:10:23 +0000<br> > Cc: <a href=3D"mailto:23098 <at> debbugs.gnu.org" target=3D"_blank">23098@d= ebbugs.gnu.org</a><br> ><br> > As an end user, I expect `recenter-to-bottom' to cycle the line wi= th point on it between the top, middle and<br> > bottom of the current window. The problem described in this report mea= ns that Emacs does not actually do<br> > this =E2=80=93 the line with point on it does not ever go even near th= e bottom of the window.<br> <br> You are judging what Emacs does by the end result: since the result is<br> not to have point near the bottom, you deduce that Emacs didn't even<br= > try.<br></blockquote><div><br></div><div>No, I am not. As I explained at le= ngth in my last mail.</div><div><br></div><blockquote class=3D"gmail_quote"= style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I = actually don't understand why you don't want to set<br> scroll-conservatively globally.=C2=A0 From what you say, it sounds like<br> that variable is exactly what you want, and not only in this<br> situation.=C2=A0 Can you explain why you don't see that as a solution?<= br></blockquote><div><br></div><div>When scrolling through the buffer with = cursor-up/cursor-down, I want full-page scroll, not single-line scroll.</di= v><div><br></div><div>When I hit C-l, I want point to end up at the bottom = at the window.</div><div><br></div><div>I do not want to lose the former ju= st so I can have the latter.</div><div><br></div><div>And, as the programme= r of a mode who tries to keep text at the bottom of the window, I most cert= ainly do not want to prescribe to the user how their scrolling with cursor-= up/cursor-down behaves just so I can keep the text at the bottom of the win= dow when I add a line.<br></div><div><br></div><div>These two situations ha= ve absolutely nothing to do with each other as far as the user experience i= s concerned. The reason why the two interact is purely technical and an art= ifact of how Emacs works underneath.<br></div><div><br></div><blockquote cl= ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p= adding-left:1ex">I'd welcome patches to try to fix this, but I think th= e best fix is<br> inside 'recenter': it should detect this situation and behave as if= <br> its argument was modified so as not to request redisplay of the window<br> with window-start point that will cause recentering of point.=C2=A0</blockq= uote><div><br></div><div>Yes, for example. Great idea.</div><div>=C2=A0<br>= </div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l= eft:1px #ccc solid;padding-left:1ex">Interested?<br></blockquote><div><br><= /div><div>No, thank you.</div><div><br></div><div>Regards,</div><div>Jorgen= </div><div><br></div></div></div> --001a114012b42b3d7d052f1f6b66--
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 28 Mar 2016 17:28:52 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Mar 28 13:28:52 2016 Received: from localhost ([127.0.0.1]:42314 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1akayB-0002p7-W8 for submit <at> debbugs.gnu.org; Mon, 28 Mar 2016 13:28:52 -0400 Received: from eggs.gnu.org ([208.118.235.92]:60360) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1akay9-0002ou-VP for 23098 <at> debbugs.gnu.org; Mon, 28 Mar 2016 13:28:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1akaxz-00032G-QS for 23098 <at> debbugs.gnu.org; Mon, 28 Mar 2016 13:28:44 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-0.2 required=5.0 tests=BAYES_50,RP_MATCHES_RCVD autolearn=disabled version=3.3.2 Received: from fencepost.gnu.org ([2001:4830:134:3::e]:58572) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1akaxz-00032C-Mk; Mon, 28 Mar 2016 13:28:39 -0400 Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4827 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1akaxy-0008OH-TT; Mon, 28 Mar 2016 13:28:39 -0400 Date: Mon, 28 Mar 2016 20:28:19 +0300 Message-Id: <83bn5yy0jw.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Jorgen =?utf-8?Q?Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> In-reply-to: <CALqDrSfJvTeBWrQ9bv9jHn97MNHSSgK7muO+zhz6Ky3ZqPOZXA@HIDDEN> (message from Jorgen =?utf-8?Q?Sch=C3=A4fer?= on Mon, 28 Mar 2016 13:10:23 +0000) Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <m2r3ewstu0.fsf@HIDDEN> <CALqDrSfJvTeBWrQ9bv9jHn97MNHSSgK7muO+zhz6Ky3ZqPOZXA@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-Spam-Score: -6.0 (------) X-Debbugs-Envelope-To: 23098 Cc: jwiegley@HIDDEN, 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: Eli Zaretskii <eliz@HIDDEN> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -6.0 (------) > From: Jorgen Schäfer <jorgen.schaefer@HIDDEN> > Date: Mon, 28 Mar 2016 13:10:23 +0000 > Cc: 23098 <at> debbugs.gnu.org > > As an end user, I expect `recenter-to-bottom' to cycle the line with point on it between the top, middle and > bottom of the current window. The problem described in this report means that Emacs does not actually do > this – the line with point on it does not ever go even near the bottom of the window. You are judging what Emacs does by the end result: since the result is not to have point near the bottom, you deduce that Emacs didn't even try. But that is false. What actually happens is that Emacs did try to do what (recenter -1) requested, except that the display engine found that doing so would have ended up with point being outside of the window. Since this is not acceptable, the display engine gave up and recentered point in the window instead. > There is a technical reason for this problem: Emacs can not, actually, display a multi-line overlay only partly. > This is a shortcoming of Emacs, but I assume this is non-trivial to fix. When Emacs notices it can not fulfill a > scroll request, it will use a fall back algorithm. Yes. > When I, as a user, try to display a line at the bottom of a window, it would appear to me that trying to keep the > line as close to the bottom as possible instead of the middle of the window is a better fall back. The problem is discovered at redisplay time, by some generic code that has no direct relation to recentering, it gets run any time some command requests that display of a window starts at a specified position. The fallback you'd like is more expensive, so using it in that code would punish users who don't bump into this use case and don't care about it. Setting scroll-conservatively is the way to tell Emacs you are generally prepared to deal with more expensive (i.e. slower) redisplay if that gives you more accurate scrolling. That's why, when scroll-conservatively is set to a large value, the display engine does try a more accurate (and more expensive) fallback. But doing that always, without the user's say-so, would be a misfeature, I think. > Setting scroll-conservatively to a large value is a way for the user to work around this behavior. But this > workaround also affects all the other times a user tries to scroll the buffer. So this is not a fix, it's a > workaround with unintended and rather large side effects completely unrelated to this. I actually don't understand why you don't want to set scroll-conservatively globally. From what you say, it sounds like that variable is exactly what you want, and not only in this situation. Can you explain why you don't see that as a solution? > A similar problems exist for programmers trying to implement a specific behavior in buffers without > prescribing to users how their normal scrolling behaves. The idea is that users who are bothered by such use cases are expected to like the effect of scroll-conservatively everywhere. > This situation strikes me as an issue Emacs could address. I'd welcome patches to try to fix this, but I think the best fix is inside 'recenter': it should detect this situation and behave as if its argument was modified so as not to request redisplay of the window with window-start point that will cause recentering of point. For example, in the test case you presented, 'recenter' should behave as if it was called with an argument of -2, not -1. The tricky part is to implement a strategy that will do reasonable things when the overlay or display string takes more than one line: depending on the original value of the argument to 'recenter', sometimes you'd want it increased, and sometimes decreased. Interested?
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 28 Mar 2016 13:10:41 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Mar 28 09:10:41 2016 Received: from localhost ([127.0.0.1]:40959 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1akWwK-0008AC-Qw for submit <at> debbugs.gnu.org; Mon, 28 Mar 2016 09:10:41 -0400 Received: from mail-lf0-f47.google.com ([209.85.215.47]:34241) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <jorgen.schaefer@HIDDEN>) id 1akWwJ-0008A0-LH for 23098 <at> debbugs.gnu.org; Mon, 28 Mar 2016 09:10:40 -0400 Received: by mail-lf0-f47.google.com with SMTP id c62so89157579lfc.1 for <23098 <at> debbugs.gnu.org>; Mon, 28 Mar 2016 06:10:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SohD3ES3H18fiRi3F+4ODbAcv3yBjeZMzXLyf4aP/Cs=; b=JB8SykppmWv9LK059CqyiJs5OE30F1URllP4JQ4VS8rC7MvoUp1/WQ6/Py3lO7nn7d Z6IXzqcLke7kpGM8zzlMVU5JWlkIcTs2D2dYoCB0RZHAVHan96HFbJcgfQ8SbEif5PZ4 HyZBz0EpXq8BuYKhJHTxdq2VxonUJPonHnizlJmgUm2K5lWRJ7PcQvr1yBObfskqd1FB pWoZN7dJV5hmSNRrX85yswzVW3nslzpOy392g7afnOXnrrNaWHkSEtDBuh/vTOMtKHwE bRoNcn59mdqtjle4LxFVkOzthgU0is1QkiYQ4TK5T8+97aJofcY6zXDLuSnCrfn+Biq2 DX/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SohD3ES3H18fiRi3F+4ODbAcv3yBjeZMzXLyf4aP/Cs=; b=Y/xmUlXp8UsyCgszOnQeZGV8N3l7wJJeWemJiJuzZRlhm9Dc5TWYogRwKIBGo6YWmS cXL71rsOs+gZDuhyl7Mae+dwGa4bxIzqt7FxlnuJCGc3rSSLQJPxC5nuRtNEOx+1ZxWP Jy5XW/52drnyXVk09L6tq+iRQdqFpW6n5zxovkQCaJd70FpNYGp3AjvJbb5uGu5KsdQb oDIVmjU4/HW0co/ERrb/Pxvi0ZsedPhHPrltn9lde6O4UAnnHchKMBm8Uj6VzHZRskkJ df7vDhNruZM7yqx71ew+G4faxLIV37N6Faa0Oyg+oJWLyDOcNkiuTT7ahaDg1iyfMNF9 lMTA== X-Gm-Message-State: AD7BkJIHHGXfCK+Zvha+RCXbTwwQENmkZHlp7WM3R4G2yBLrz5C7Gv2bMNG8Jc+snpiqAYuE49SsEkbtnEPgfA== X-Received: by 10.25.80.1 with SMTP id e1mr7905984lfb.165.1459170633895; Mon, 28 Mar 2016 06:10:33 -0700 (PDT) MIME-Version: 1.0 References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <m2r3ewstu0.fsf@HIDDEN> In-Reply-To: <m2r3ewstu0.fsf@HIDDEN> From: =?UTF-8?Q?Jorgen_Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> Date: Mon, 28 Mar 2016 13:10:23 +0000 Message-ID: <CALqDrSfJvTeBWrQ9bv9jHn97MNHSSgK7muO+zhz6Ky3ZqPOZXA@HIDDEN> Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window To: John Wiegley <jwiegley@HIDDEN> Content-Type: multipart/alternative; boundary=001a114195144cd6f7052f1ba364 X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) --001a114195144cd6f7052f1ba364 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Sun, Mar 27, 2016 at 12:33 AM John Wiegley <jwiegley@HIDDEN> wrote: > So is the bug here that it can't be done, or that (recenter -1) by itself > doesn't do what you think it should? As an end user, I expect `recenter-to-bottom' to cycle the line with point on it between the top, middle and bottom of the current window. The problem described in this report means that Emacs does not actually do this =E2=80= =93 the line with point on it does not ever go even near the bottom of the window. There is a technical reason for this problem: Emacs can not, actually, display a multi-line overlay only partly. This is a shortcoming of Emacs, but I assume this is non-trivial to fix. When Emacs notices it can not fulfill a scroll request, it will use a fall back algorithm. When I, as a user, try to display a line at the bottom of a window, it would appear to me that trying to keep the line as close to the bottom as possible instead of the middle of the window is a better fall back. Setting scroll-conservatively to a large value is a way for the user to work around this behavior. But this workaround also affects all the other times a user tries to scroll the buffer. So this is not a fix, it's a workaround with unintended and rather large side effects completely unrelated to this. A similar problems exist for programmers trying to implement a specific behavior in buffers without prescribing to users how their normal scrolling behaves. This situation strikes me as an issue Emacs could address. Regards, Jorgen --001a114195144cd6f7052f1ba364 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr">On Sun, Mar 27= , 2016 at 12:33 AM John Wiegley <<a href=3D"mailto:jwiegley@HIDDEN">j= wiegley@HIDDEN</a>> wrote:</div><blockquote class=3D"gmail_quote" sty= le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> So is the bug here that it can't be done, or that (recenter -1) by itse= lf<br> doesn't do what you think it should?</blockquote><div><br></div><div>As= an end user, I expect `recenter-to-bottom' to cycle the line with poin= t on it between the top, middle and bottom of the current window. The probl= em described in this report means that Emacs does not actually do this =E2= =80=93 the line with point on it does not ever go even near the bottom of t= he window.</div><div><br></div><div>There is a technical reason for this pr= oblem: Emacs can not, actually, display a multi-line overlay only partly. T= his is a shortcoming of Emacs, but I assume this is non-trivial to fix. Whe= n Emacs notices it can not fulfill a scroll request, it will use a fall bac= k algorithm.</div><div><br></div><div>When I, as a user, try to display a l= ine at the bottom of a window, it would appear to me that trying to keep th= e line as close to the bottom as possible instead of the middle of the wind= ow is a better fall back.</div><div><br></div><div>Setting scroll-conservat= ively to a large value is a way for the user to work around this behavior. = But this workaround also affects all the other times a user tries to scroll= the buffer. So this is not a fix, it's a workaround with unintended an= d rather large side effects completely unrelated to this.</div><div><br></d= iv><div>A similar problems exist for programmers trying to implement a spec= ific behavior in buffers without prescribing to users how their normal scro= lling behaves.</div><div><br></div><div>This situation strikes me as an iss= ue Emacs could address.</div><div><br></div><div>Regards,</div><div>Jorgen<= /div></div></div> --001a114195144cd6f7052f1ba364--
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 27 Mar 2016 15:07:34 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Mar 27 11:07:34 2016 Received: from localhost ([127.0.0.1]:40183 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1akCHu-0003SI-9I for submit <at> debbugs.gnu.org; Sun, 27 Mar 2016 11:07:34 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:36959) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <drew.adams@HIDDEN>) id 1akCHr-0003S5-TW for 23098 <at> debbugs.gnu.org; Sun, 27 Mar 2016 11:07:32 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u2RF7PKA010045 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sun, 27 Mar 2016 15:07:25 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0022.oracle.com (8.13.8/8.13.8) with ESMTP id u2RF7PkY006714 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sun, 27 Mar 2016 15:07:25 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.13.8/8.13.8) with ESMTP id u2RF7PKC017387; Sun, 27 Mar 2016 15:07:25 GMT MIME-Version: 1.0 Message-ID: <d994a790-b704-47ef-8c40-c33eda845db0@default> Date: Sun, 27 Mar 2016 08:07:24 -0700 (PDT) From: Drew Adams <drew.adams@HIDDEN> To: Andreas Schwab <schwab@HIDDEN>, John Wiegley <jwiegley@HIDDEN> Subject: RE: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <m2r3ewstu0.fsf@HIDDEN> <m28u14z5bt.fsf@HIDDEN> In-Reply-To: <m28u14z5bt.fsf@HIDDEN> X-Priority: 3 X-Mailer: Oracle Beehive Extensions for Outlook 2.0.1.9 (901082) [OL 12.0.6744.5000 (x86)] Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Source-IP: aserv0022.oracle.com [141.146.126.234] X-Spam-Score: -3.3 (---) X-Debbugs-Envelope-To: 23098 Cc: =?iso-8859-1?B?Sm9yZ2VuIFNjaORmZXI=?= <jorgen.schaefer@HIDDEN>, 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > > (add-to-list > > 'erc-mode-hook > > #'(lambda () (set (make-local-variable 'scroll-conservatively) 100))= ) >=20 > You should use add-hook for hook variables. Also (nits): 1. No need to use #' with lambdas (no advantage in a context that expects a function). 2. It is generally a good idea to use a named function (not a lambda) on a hook. For one thing, removing it is easier and more robust (`remove-hook') - no worries about differences in whitespace etc. 3. Emacs now has `setq-local': `(setq-local VAR VALUE)'. (I too use `(set (make-local-variable VAR) VALUE)', but mainly because I usually need code that works also for older Emacs versions.)
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 27 Mar 2016 08:35:49 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Mar 27 04:35:49 2016 Received: from localhost ([127.0.0.1]:39131 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ak6An-0000cO-5q for submit <at> debbugs.gnu.org; Sun, 27 Mar 2016 04:35:49 -0400 Received: from mail-out.m-online.net ([212.18.0.10]:36925) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <whitebox@HIDDEN>) id 1ak6Al-0000cG-HS for 23098 <at> debbugs.gnu.org; Sun, 27 Mar 2016 04:35:47 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 3qXr363Ndnz3hjkG; Sun, 27 Mar 2016 10:35:46 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 3qXr361Ct3zvhPC; Sun, 27 Mar 2016 10:35:46 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavisd-new, port 10024) with ESMTP id EjjC3RlHRzgV; Sun, 27 Mar 2016 10:35:44 +0200 (CEST) X-Auth-Info: +fNVBTZpuVCM0vZwFDA0g1SWWqe/ai7TdAartH+bYu1in0seiEB6smcRUjP761ib Received: from linux.local (ppp-88-217-9-29.dynamic.mnet-online.de [88.217.9.29]) by mail.mnet-online.de (Postfix) with ESMTPA; Sun, 27 Mar 2016 10:35:44 +0200 (CEST) Received: by linux.local (Postfix, from userid 501) id 3A8701E5465; Sun, 27 Mar 2016 10:35:30 +0200 (CEST) From: Andreas Schwab <schwab@HIDDEN> To: John Wiegley <jwiegley@HIDDEN> Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <m2r3ewstu0.fsf@HIDDEN> X-Yow: The LOGARITHM of an ISOSCELES TRIANGLE is TUESDAY WELD!! Date: Sun, 27 Mar 2016 10:35:18 +0200 In-Reply-To: <m2r3ewstu0.fsf@HIDDEN> (John Wiegley's message of "Sat, 26 Mar 2016 16:27:51 -0700") Message-ID: <m28u14z5bt.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 23098 Cc: Jorgen =?utf-8?Q?Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN>, 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) John Wiegley <jwiegley@HIDDEN> writes: > (add-to-list > 'erc-mode-hook > #'(lambda () (set (make-local-variable 'scroll-conservatively) 100))) You should use add-hook for hook variables. Andreas. -- Andreas Schwab, schwab@HIDDEN GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."
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Subject: Re: bug#23098: 25.0.92;
(recenter -1) can leave point in the middle of the window
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>>>>> Jorgen Sch=C3=A4fer <jorgen.schaefer@HIDDEN> writes:
> The use case here are buffers like comint or IRC chat buffers.
FWIW, I use "scroll to bottom" in ERC, and all I had to do to make it work =
was
the following:
(add-to-list
'erc-mode-hook
#'(lambda () (set (make-local-variable 'scroll-conservatively) 100)))
So is the bug here that it can't be done, or that (recenter -1) by itself
doesn't do what you think it should?
--=20
John Wiegley GPG fingerprint =3D 4710 CF98 AF9B 327B B80F
http://newartisans.com 60E1 46C4 BD1A 7AC1 4BA2
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 24 Mar 2016 16:38:36 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Mar 24 12:38:36 2016 Received: from localhost ([127.0.0.1]:36387 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aj8HM-0000yA-Ae for submit <at> debbugs.gnu.org; Thu, 24 Mar 2016 12:38:36 -0400 Received: from eggs.gnu.org ([208.118.235.92]:41122) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1aj8HK-0000xv-QD for 23098 <at> debbugs.gnu.org; Thu, 24 Mar 2016 12:38:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1aj8HC-0001Lh-KH for 23098 <at> debbugs.gnu.org; Thu, 24 Mar 2016 12:38:29 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,T_RP_MATCHES_RCVD autolearn=disabled version=3.3.2 Received: from fencepost.gnu.org ([2001:4830:134:3::e]:53113) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1aj8HC-0001Ld-HG; Thu, 24 Mar 2016 12:38:26 -0400 Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3447 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1aj8HB-0000pq-Sv; Thu, 24 Mar 2016 12:38:26 -0400 Date: Thu, 24 Mar 2016 18:38:12 +0200 Message-Id: <83y49725mz.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Jorgen =?utf-8?Q?Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> In-reply-to: <CALqDrSdksWUz35oL47GX66YLRmw1pq+-CBfp80RSPTF4-0gyVQ@HIDDEN> (message from Jorgen =?utf-8?Q?Sch=C3=A4fer?= on Thu, 24 Mar 2016 16:27:53 +0000) Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <83a8lp2bd4.fsf@HIDDEN> <CALqDrSfFddK7B_nMuuDHe+eHgq=dhWOAE2rZk0C1JZ4nmbMqFw@HIDDEN> <8360wb3mj5.fsf@HIDDEN> <CALqDrSdksWUz35oL47GX66YLRmw1pq+-CBfp80RSPTF4-0gyVQ@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: Eli Zaretskii <eliz@HIDDEN> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.0 (-----) > From: Jorgen Schäfer <jorgen.schaefer@HIDDEN> > Date: Thu, 24 Mar 2016 16:27:53 +0000 > Cc: 23098 <at> debbugs.gnu.org > > > If you do the above, do you still get the cursor recentered in the > > window? > > Hm. That seems to work. OK, so at least we see the same behavior. > I was using let-binding around recenter, which does not work. Indeed, it won't work because the value of scroll-conservatively needs to be seen by redisplay, which runs after the code of the test case finishes execution. You could try let-binding it around a call to 'redisplay', but that's probably gross. > Even resetting > scroll-conservatively after the call to recenter will exhibit the bug again. So setting scroll-conservatively is a > possible workaround, although it means that *all* scrolling will be affected by scroll-conservatively. E.g. > scrolling through the backlog of a M-x shell session would be affected, even though it just should affect the > scrolling when the last line of the buffer is visible at all. Well, setting scroll-conservatively is the only way in Emacs to reliably avoid recentering of point in all kinds of corner cases. So if you cannot use that setting, I'm afraid I'm out of ideas. Thanks.
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 24 Mar 2016 16:28:11 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Mar 24 12:28:11 2016 Received: from localhost ([127.0.0.1]:36370 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aj87G-0000a3-O1 for submit <at> debbugs.gnu.org; Thu, 24 Mar 2016 12:28:11 -0400 Received: from mail-lf0-f46.google.com ([209.85.215.46]:35757) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <jorgen.schaefer@HIDDEN>) id 1aj87F-0000Zq-H2 for 23098 <at> debbugs.gnu.org; Thu, 24 Mar 2016 12:28:09 -0400 Received: by mail-lf0-f46.google.com with SMTP id q73so36603995lfe.2 for <23098 <at> debbugs.gnu.org>; Thu, 24 Mar 2016 09:28:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=VwZUeB1SVWheAy7IyfBsW4CzLZ6rkp8b4O/8Z4JRTLM=; b=Sjq8DO0uybHi+Er+VxbGIDkzgcQ8Lef7q5XLayJcG0fVCkcfno0m480gWHDjqcrAO4 e0Zr3WvlZS1IUI4rt85toLBULDH7RdE33eJ+EifPzXCU7mYhhMiFeMvuNLldxNCb8mTO 6xaPeB60m5S3F+5c/LH/XuxkAMd8z7nXQmQNDH8ZUlmf5SMhNQDl+PMrV6ASaVAURSCj Dt3AeY9Ng5xFK7b4UBl3NDCAOE/LuB9Ohb+yHZfQ88lWS4L0KDHtQwjWicMyyT28BlYG HV7GsEZICeMbWgEZjiCO4voGjcjdQO3K+lObEkQQGWkdVes7jzzKuDSIetGsIGHxKpuD Edug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=VwZUeB1SVWheAy7IyfBsW4CzLZ6rkp8b4O/8Z4JRTLM=; b=GTv0HIuZKcJ6g/SS/Q12yRRkkR2L3YJwhWs1WhTg63UjXSE0IiKMSnVZtSunE4Vw5o ZBl1Xe4RLfRI8fRmVD+vHiRUNNJ53il9/X7kpbR+HzWgWdK/ZzN6uplv5tGuvUwgGE2j rbS8k4T/RzX2o2+1rPD0y4olxGlUp8Oqc7JpW19bA9ZUhacGY/VBeRgTsTzBmaduJdmM HjdNSjne4gr4ZY/zpBWEnrOnDnA6ankbcKvd6jXepfjETHvhYJGsr6se06FX45B34JG6 FsIuW/mbm1Cq4I8rUnbN4T2R47zaaMqZQeAUWuf3X/ihYFMAu12AlKjwxhZMMy2Dk5fK Hz0w== X-Gm-Message-State: AD7BkJKxrI+1Jdt+qBU19Sxm7m7dY6P528yIpVJSDvv3syJSXWCFyeLTx1ChOs0TLsFVqXvFCdd9SyRJU6qXJg== X-Received: by 10.25.86.195 with SMTP id k186mr3883534lfb.155.1458836883732; Thu, 24 Mar 2016 09:28:03 -0700 (PDT) MIME-Version: 1.0 References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <83a8lp2bd4.fsf@HIDDEN> <CALqDrSfFddK7B_nMuuDHe+eHgq=dhWOAE2rZk0C1JZ4nmbMqFw@HIDDEN> <8360wb3mj5.fsf@HIDDEN> In-Reply-To: <8360wb3mj5.fsf@HIDDEN> From: =?UTF-8?Q?Jorgen_Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> Date: Thu, 24 Mar 2016 16:27:53 +0000 Message-ID: <CALqDrSdksWUz35oL47GX66YLRmw1pq+-CBfp80RSPTF4-0gyVQ@HIDDEN> Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window To: Eli Zaretskii <eliz@HIDDEN> Content-Type: multipart/alternative; boundary=001a11410d843d7ffb052ecdee81 X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) --001a11410d843d7ffb052ecdee81 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable > If you do the above, do you still get the cursor recentered in the > window? Hm. That seems to work. I was using let-binding around recenter, which does not work. Even resetting scroll-conservatively after the call to recenter will exhibit the bug again. So setting scroll-conservatively is a possible workaround, although it means that *all* scrolling will be affected by scroll-conservatively. E.g. scrolling through the backlog of a M-x shell session would be affected, even though it just should affect the scrolling when the last line of the buffer is visible at all. On Thu, Mar 24, 2016 at 4:48 PM Eli Zaretskii <eliz@HIDDEN> wrote: > > From: Jorgen Sch=C3=A4fer <jorgen.schaefer@HIDDEN> > > Date: Thu, 24 Mar 2016 08:12:08 +0000 > > Cc: 23098 <at> debbugs.gnu.org > > > > > If you set scroll-conservatively to a value larger than 100, don't yo= u > > > get point as low as possible? > > > > No. > > That's strange. > > Let me be absolutely sure we are trying the same thing. What I did is > the following: > > . emacs -Q > . paste the following into *scratch*, which is exactly the code you > posted with a single line added: > > (require 'cl) > (let* ((b (get-buffer-create "*Bug Repro*")) > (w (selected-window)) > (l (window-height w)) > o) > (set-window-buffer w b) > (select-window w) > (set-buffer b) > (erase-buffer) > (setq scroll-conservatively 101) ;; <<<<< this line was added > (cl-dotimes (i (* l 2)) > (insert "foo\n")) > (goto-char (point-min)) > (forward-line (+ l 2)) > (setq o (make-overlay (point) (point))) > (overlay-put o 'after-string "\n") > (goto-char (point-max)) > (recenter -1)) > > . M-x eval-region RET > > After this, buffer "*Bug Repro*" pops up, with point at EOB positioned > on the 2nd line from bottom of the window (instead of the last line). > > If you do the above, do you still get the cursor recentered in the > window? If so, I will try to play with display defaults in order to > reproduce what you see. > > Thanks. > --001a11410d843d7ffb052ecdee81 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">>=C2=A0If you do the above, do you still get the cursor= recentered in the<br>> window?<div><br></div><div>Hm. That seems to wor= k. I was using let-binding around recenter, which does not work. Even reset= ting scroll-conservatively after the call to recenter will exhibit the bug = again. So setting scroll-conservatively is a possible workaround, although = it means that *all* scrolling will be affected by scroll-conservatively. E.= g. scrolling through the backlog of a M-x shell session would be affected, = even though it just should affect the scrolling when the last line of the b= uffer is visible at all.</div></div><br><div class=3D"gmail_quote"><div dir= =3D"ltr">On Thu, Mar 24, 2016 at 4:48 PM Eli Zaretskii <<a href=3D"mailt= o:eliz@HIDDEN">eliz@HIDDEN</a>> wrote:<br></div><blockquote class=3D"g= mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l= eft:1ex">> From: Jorgen Sch=C3=A4fer <<a href=3D"mailto:jorgen.schaef= er@HIDDEN" target=3D"_blank">jorgen.schaefer@HIDDEN</a>><br> > Date: Thu, 24 Mar 2016 08:12:08 +0000<br> > Cc: <a href=3D"mailto:23098 <at> debbugs.gnu.org" target=3D"_blank">23098@d= ebbugs.gnu.org</a><br> ><br> > > If you set scroll-conservatively to a value larger than 100, don&= #39;t you<br> > > get point as low as possible?<br> ><br> > No.<br> <br> That's strange.<br> <br> Let me be absolutely sure we are trying the same thing.=C2=A0 What I did is= <br> the following:<br> <br> =C2=A0 . emacs -Q<br> =C2=A0 . paste the following into *scratch*, which is exactly the code you<= br> =C2=A0 =C2=A0 posted with a single line added:<br> <br> =C2=A0 =C2=A0 (require 'cl)<br> =C2=A0 =C2=A0 (let* ((b (get-buffer-create "*Bug Repro*"))<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(w (selected-window))<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(l (window-height w))<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0o)<br> =C2=A0 =C2=A0 =C2=A0 (set-window-buffer w b)<br> =C2=A0 =C2=A0 =C2=A0 (select-window w)<br> =C2=A0 =C2=A0 =C2=A0 (set-buffer b)<br> =C2=A0 =C2=A0 =C2=A0 (erase-buffer)<br> =C2=A0 =C2=A0 =C2=A0 (setq scroll-conservatively 101) ;; <<<<&l= t; this line was added<br> =C2=A0 =C2=A0 =C2=A0 (cl-dotimes (i (* l 2))<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (insert &quo= t;foo\n"))<br> =C2=A0 =C2=A0 =C2=A0 (goto-char (point-min))<br> =C2=A0 =C2=A0 =C2=A0 (forward-line (+ l 2))<br> =C2=A0 =C2=A0 =C2=A0 (setq o (make-overlay (point) (point)))<br> =C2=A0 =C2=A0 =C2=A0 (overlay-put o 'after-string "\n")<br> =C2=A0 =C2=A0 =C2=A0 (goto-char (point-max))<br> =C2=A0 =C2=A0 =C2=A0 (recenter -1))<br> <br> =C2=A0 . M-x eval-region RET<br> <br> After this, buffer "*Bug Repro*" pops up, with point at EOB posit= ioned<br> on the 2nd line from bottom of the window (instead of the last line).<br> <br> If you do the above, do you still get the cursor recentered in the<br> window?=C2=A0 If so, I will try to play with display defaults in order to<b= r> reproduce what you see.<br> <br> Thanks.<br> </blockquote></div> --001a11410d843d7ffb052ecdee81--
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
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Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle
of the window
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> From: Jorgen Schäfer <jorgen.schaefer@HIDDEN>
> Date: Thu, 24 Mar 2016 08:12:08 +0000
> Cc: 23098 <at> debbugs.gnu.org
>
> > If you set scroll-conservatively to a value larger than 100, don't you
> > get point as low as possible?
>
> No.
That's strange.
Let me be absolutely sure we are trying the same thing. What I did is
the following:
. emacs -Q
. paste the following into *scratch*, which is exactly the code you
posted with a single line added:
(require 'cl)
(let* ((b (get-buffer-create "*Bug Repro*"))
(w (selected-window))
(l (window-height w))
o)
(set-window-buffer w b)
(select-window w)
(set-buffer b)
(erase-buffer)
(setq scroll-conservatively 101) ;; <<<<< this line was added
(cl-dotimes (i (* l 2))
(insert "foo\n"))
(goto-char (point-min))
(forward-line (+ l 2))
(setq o (make-overlay (point) (point)))
(overlay-put o 'after-string "\n")
(goto-char (point-max))
(recenter -1))
. M-x eval-region RET
After this, buffer "*Bug Repro*" pops up, with point at EOB positioned
on the 2nd line from bottom of the window (instead of the last line).
If you do the above, do you still get the cursor recentered in the
window? If so, I will try to play with display defaults in order to
reproduce what you see.
Thanks.
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 24 Mar 2016 08:12:26 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Mar 24 04:12:26 2016 Received: from localhost ([127.0.0.1]:35046 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aj0NW-0001Ma-Gd for submit <at> debbugs.gnu.org; Thu, 24 Mar 2016 04:12:26 -0400 Received: from mail-lb0-f176.google.com ([209.85.217.176]:34095) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <jorgen.schaefer@HIDDEN>) id 1aj0NU-0001MN-Pk for 23098 <at> debbugs.gnu.org; Thu, 24 Mar 2016 04:12:25 -0400 Received: by mail-lb0-f176.google.com with SMTP id k12so25387209lbb.1 for <23098 <at> debbugs.gnu.org>; Thu, 24 Mar 2016 01:12:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=E8DTXFGMcfnmT14H37CZGGpxa18FKhE+siIxxCxEwhY=; b=q4u2aChS2WU0j2HmWZlU4Iq8ZOej7lwGn9QsnuZRQuKza0dWKBaJa3WkqkTpg8+U0F QreO9FK7/yrjow3s8ojr5xwFXuT2fpmp1+J/OkSevgfnocAiYzU5tKKM2dLTWkUigp8i 8Xodgvdj7lOdbK8f7BtRUfHQHW7NFvfJpGcc2VNwHzvXYaGyR+CsxjgkJpy/Nxutx1Y0 YyTemBqYruH+B97GqxknlXgnc26KyOC18672bv4OtSWjLmNHvJw9iFoa85IXaQ1xWVG/ LuQaqlEjUkHn3q626qXZ6oTMGj8ajDqETOmgBRN9lDkMFUt6RSbz6+ptSSc1f3motHDk 1+NQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=E8DTXFGMcfnmT14H37CZGGpxa18FKhE+siIxxCxEwhY=; b=iAWCvI/LXjaigV8QzCcNq1nu8jeAHbpDYVjFBmCEoDKe/wx8WE77LvCpRxc0RqOWVK WUDZNbaxgeKM25MUD+0hC6xAQCeh+A6fP2eV7YxXXVoTh1rd5pzbG7VM/vep3zN+uC9Y wfjrQR9Y5I8BgESWCWYe/ktkb0Myf/F1VuuFve1yoDyfrL4POotSuFmhO0ouczLV1wO7 1EnhY8/I/l/EhM6M7hJy7ASQrYD7fPdiQo18aceZXJgmR5004ldr0mX8IWZaobERmxjn /VIHSsoiW2xwx/pgGsTcvC8S6o41c7L2Rb2d5HZMNtvC1SxLWcmTJeMjGpWgzUbv6rSV v+JA== X-Gm-Message-State: AD7BkJJg3op4pAUd4vObh2tv1UxmkAtA0+Fsd0FjMvdC0ZiuAMqqlqlEUUNY1DkOXFRMELUSzsOyfMFnhNBjYQ== X-Received: by 10.112.161.131 with SMTP id xs3mr2851806lbb.65.1458807138819; Thu, 24 Mar 2016 01:12:18 -0700 (PDT) MIME-Version: 1.0 References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> <83a8lp2bd4.fsf@HIDDEN> In-Reply-To: <83a8lp2bd4.fsf@HIDDEN> From: =?UTF-8?Q?Jorgen_Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> Date: Thu, 24 Mar 2016 08:12:08 +0000 Message-ID: <CALqDrSfFddK7B_nMuuDHe+eHgq=dhWOAE2rZk0C1JZ4nmbMqFw@HIDDEN> Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window To: Eli Zaretskii <eliz@HIDDEN> Content-Type: multipart/alternative; boundary=001a11c31f524e2447052ec701cc X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) --001a11c31f524e2447052ec701cc Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable > If you set scroll-conservatively to a value larger than 100, don't you > get point as low as possible? No. On Wed, Mar 23, 2016 at 9:22 PM Eli Zaretskii <eliz@HIDDEN> wrote: > > From: Jorgen Sch=C3=A4fer <jorgen.schaefer@HIDDEN> > > Date: Wed, 23 Mar 2016 19:40:50 +0000 > > Cc: 23098 <at> debbugs.gnu.org > > > > The use case here are buffers like comint or IRC chat buffers. It's nic= e > to keep the last line of the buffer flush > > with the last line of the window, to show the maximum amount of data. > (recenter -1) at the end of a buffer is > > supposed to do just that. In this case, it does not, but instead leaves > point in the *middle* of the window. > > Yes, because the scrolling fails, and Emacs falls back on recentering. > > > If it is not possible to display that line halfway (which sounds like a > missing feature to begin with), I would > > expect Emacs to least try to leave point as low in the window as > possible, instead of in the middle of the > > window. C-l likewise won't move point any further down, for example. > > If you set scroll-conservatively to a value larger than 100, don't you > get point as low as possible? > --001a11c31f524e2447052ec701cc Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">>=C2=A0If you set scroll-conservatively to a value larg= er than 100, don't you<br>> get point as low as possible?<div><br></= div><div>No.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On = Wed, Mar 23, 2016 at 9:22 PM Eli Zaretskii <<a href=3D"mailto:eliz@HIDDEN= rg">eliz@HIDDEN</a>> wrote:<br></div><blockquote class=3D"gmail_quote" = style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">>= ; From: Jorgen Sch=C3=A4fer <<a href=3D"mailto:jorgen.schaefer@HIDDEN= " target=3D"_blank">jorgen.schaefer@HIDDEN</a>><br> > Date: Wed, 23 Mar 2016 19:40:50 +0000<br> > Cc: <a href=3D"mailto:23098 <at> debbugs.gnu.org" target=3D"_blank">23098@d= ebbugs.gnu.org</a><br> ><br> > The use case here are buffers like comint or IRC chat buffers. It'= s nice to keep the last line of the buffer flush<br> > with the last line of the window, to show the maximum amount of data. = (recenter -1) at the end of a buffer is<br> > supposed to do just that. In this case, it does not, but instead leave= s point in the *middle* of the window.<br> <br> Yes, because the scrolling fails, and Emacs falls back on recentering.<br> <br> > If it is not possible to display that line halfway (which sounds like = a missing feature to begin with), I would<br> > expect Emacs to least try to leave point as low in the window as possi= ble, instead of in the middle of the<br> > window. C-l likewise won't move point any further down, for exampl= e.<br> <br> If you set scroll-conservatively to a value larger than 100, don't you<= br> get point as low as possible?<br> </blockquote></div> --001a11c31f524e2447052ec701cc--
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 23 Mar 2016 20:22:42 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Mar 23 16:22:42 2016 Received: from localhost ([127.0.0.1]:34808 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aipIg-0004QX-FW for submit <at> debbugs.gnu.org; Wed, 23 Mar 2016 16:22:42 -0400 Received: from eggs.gnu.org ([208.118.235.92]:48666) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1aipIe-0004QH-9y for 23098 <at> debbugs.gnu.org; Wed, 23 Mar 2016 16:22:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1aipIW-0002mo-55 for 23098 <at> debbugs.gnu.org; Wed, 23 Mar 2016 16:22:35 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,T_RP_MATCHES_RCVD autolearn=disabled version=3.3.2 Received: from fencepost.gnu.org ([2001:4830:134:3::e]:58223) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1aipIW-0002mk-1K; Wed, 23 Mar 2016 16:22:32 -0400 Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:2447 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1aipIV-0004Z0-1X; Wed, 23 Mar 2016 16:22:31 -0400 Date: Wed, 23 Mar 2016 22:22:15 +0200 Message-Id: <83a8lp2bd4.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Jorgen =?utf-8?Q?Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> In-reply-to: <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> (message from Jorgen =?utf-8?Q?Sch=C3=A4fer?= on Wed, 23 Mar 2016 19:40:50 +0000) Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: Eli Zaretskii <eliz@HIDDEN> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.0 (-----) > From: Jorgen Schäfer <jorgen.schaefer@HIDDEN> > Date: Wed, 23 Mar 2016 19:40:50 +0000 > Cc: 23098 <at> debbugs.gnu.org > > The use case here are buffers like comint or IRC chat buffers. It's nice to keep the last line of the buffer flush > with the last line of the window, to show the maximum amount of data. (recenter -1) at the end of a buffer is > supposed to do just that. In this case, it does not, but instead leaves point in the *middle* of the window. Yes, because the scrolling fails, and Emacs falls back on recentering. > If it is not possible to display that line halfway (which sounds like a missing feature to begin with), I would > expect Emacs to least try to leave point as low in the window as possible, instead of in the middle of the > window. C-l likewise won't move point any further down, for example. If you set scroll-conservatively to a value larger than 100, don't you get point as low as possible?
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 23 Mar 2016 19:41:08 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Mar 23 15:41:08 2016 Received: from localhost ([127.0.0.1]:34766 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aioeS-0003LQ-61 for submit <at> debbugs.gnu.org; Wed, 23 Mar 2016 15:41:08 -0400 Received: from mail-lf0-f50.google.com ([209.85.215.50]:33208) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <jorgen.schaefer@HIDDEN>) id 1aioeQ-0003Kz-Px for 23098 <at> debbugs.gnu.org; Wed, 23 Mar 2016 15:41:07 -0400 Received: by mail-lf0-f50.google.com with SMTP id o73so19220849lfe.0 for <23098 <at> debbugs.gnu.org>; Wed, 23 Mar 2016 12:41:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qt3E6pcPr7Soqv2NmK/CQP5xQMwntWpQ26esfcSCcSo=; b=i4v9duHNLuxvMi21/p6z4HpNISm+1n0idVvCH56NDyNArkPpt/ZkF5mfKBv/BodpHI 2J4wbCN7MZwXfgmgC0vcRK3NKsE1HmP/IjN1y46W1vzgFbNyFuqdAeI1QLI+WK6gg60g Nh2IbV9N30/aJ9FPM0LAw8500sQYiRqeoeTkDQlztZF5qrDd8dmdCo/8NLflWnq0ALf1 zwK/BFDpmCf7hRR5JDL0EV6908YwAmG/5Wa9t1CeBrxl76iMLmBX4xacv35wKqkrl8Ww TBaaLlB5fs49iWqEBbRizkvDi+R9ZJGYOyc0zHx/CPs6g3T5lP3P+rj3v5rya8NWNc9S eCQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=qt3E6pcPr7Soqv2NmK/CQP5xQMwntWpQ26esfcSCcSo=; b=gM3a6h+lD5nCuiXew0C4RIDcMJXWhCNTvzvptOLAUEjpRBJLYzeiuzPxnYY1feQcdW pCTe18TaInWaHXFcLfwoDhcqV8YnJQAqXm4EfduoVdsgW5JH5W565rCLfe2cEiQmgFhp tuhlQoN5UlWFEO0oix0uGmMVnAzZv1D+wiryGR6zla/bWJArDPAnfxinCQch80EuJ2u+ rlhKpfTGzIEmgeC5KM/fm+diuk7RSGgdiiyEazUTK7beBkTRHfvKCngBPXF6IipqAL05 O++JgkyZmPpg0gTKn4L/LE7DfhGCrCfviaPk+6u45LHpIoYgCahW7f8/oQJmrmlinjnd I5GQ== X-Gm-Message-State: AD7BkJLs2x2iAM0KLdUxG56YUxGZn7h5F1KaGJFUikqtvpJk+MC5eYabJX87lbmDrx+X4uFE1aaKx2K5rMmBOA== X-Received: by 10.25.21.94 with SMTP id l91mr1963262lfi.25.1458762060806; Wed, 23 Mar 2016 12:41:00 -0700 (PDT) MIME-Version: 1.0 References: <87r3f19gx0.fsf@HIDDEN> <83d1ql2ebx.fsf@HIDDEN> In-Reply-To: <83d1ql2ebx.fsf@HIDDEN> From: =?UTF-8?Q?Jorgen_Sch=C3=A4fer?= <jorgen.schaefer@HIDDEN> Date: Wed, 23 Mar 2016 19:40:50 +0000 Message-ID: <CALqDrSe7GUay_h0q9aKzfrwgP6OVU_QzS_tVhCHn5DV8a+CoUw@HIDDEN> Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window To: Eli Zaretskii <eliz@HIDDEN> Content-Type: multipart/alternative; boundary=001a113f17d6723f3e052ebc82d8 X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) --001a113f17d6723f3e052ebc82d8 Content-Type: text/plain; charset=UTF-8 Hello! The use case here are buffers like comint or IRC chat buffers. It's nice to keep the last line of the buffer flush with the last line of the window, to show the maximum amount of data. (recenter -1) at the end of a buffer is supposed to do just that. In this case, it does not, but instead leaves point in the *middle* of the window. If it is not possible to display that line halfway (which sounds like a missing feature to begin with), I would expect Emacs to least try to leave point as low in the window as possible, instead of in the middle of the window. C-l likewise won't move point any further down, for example. Regards, Jorgen On Wed, Mar 23, 2016 at 8:18 PM Eli Zaretskii <eliz@HIDDEN> wrote: > > From: Jorgen Schaefer <jorgen.schaefer@HIDDEN> > > Date: Wed, 23 Mar 2016 19:40:27 +0100 > > > > Evaluating the following code in "emacs -Q" leaves point in the middle > > of the window, instead of at the end of the window as expected. Certain > > modes (IRC) want to keep the buffer flushed at the end of the window, > > this problem interferes with that behavior and causes very weird jumpy > > scrolling. > > > > > > (require 'cl) > > (let* ((b (get-buffer-create "*Bug Repro*")) > > (w (selected-window)) > > (l (window-height w)) > > o) > > (set-window-buffer w b) > > (select-window w) > > (set-buffer b) > > (erase-buffer) > > (cl-dotimes (i (* l 2)) > > (insert "foo\n")) > > (goto-char (point-min)) > > (forward-line (+ l 2)) > > (setq o (make-overlay (point) (point))) > > (overlay-put o 'after-string "\n") > > (goto-char (point-max)) > > (recenter -1)) > > > > > > That is, if there is a multi-line overlay that would be shown only > > halfway. > > I'm not sure I understand: are you trying to display a window whose > start point is in the middle of an overlay string? That's not > possible, AFAIK. The window-start point must be a buffer position. > --001a113f17d6723f3e052ebc82d8 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Hello!<div>The use case here are buffers like comint or IR= C chat buffers. It's nice to keep the last line of the buffer flush wit= h the last line of the window, to show the maximum amount of data. (recente= r -1) at the end of a buffer is supposed to do just that. In this case, it = does not, but instead leaves point in the *middle* of the window.</div><div= ><br></div><div>If it is not possible to display that line halfway (which s= ounds like a missing feature to begin with), I would expect Emacs to least = try to leave point as low in the window as possible, instead of in the midd= le of the window. C-l likewise won't move point any further down, for e= xample.</div><div><br></div><div>Regards,</div><div>Jorgen</div></div><br><= div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Mar 23, 2016 at 8:18 PM = Eli Zaretskii <<a href=3D"mailto:eliz@HIDDEN">eliz@HIDDEN</a>> wrot= e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo= rder-left:1px #ccc solid;padding-left:1ex">> From: Jorgen Schaefer <<= a href=3D"mailto:jorgen.schaefer@HIDDEN" target=3D"_blank">jorgen.schaef= er@HIDDEN</a>><br> > Date: Wed, 23 Mar 2016 19:40:27 +0100<br> ><br> > Evaluating the following code in "emacs -Q" leaves point in = the middle<br> > of the window, instead of at the end of the window as expected. Certai= n<br> > modes (IRC) want to keep the buffer flushed at the end of the window,<= br> > this problem interferes with that behavior and causes very weird jumpy= <br> > scrolling.<br> ><br> ><br> > (require 'cl)<br> > (let* ((b (get-buffer-create "*Bug Repro*"))<br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 (w (selected-window))<br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 (l (window-height w))<br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 o)<br> >=C2=A0 =C2=A0(set-window-buffer w b)<br> >=C2=A0 =C2=A0(select-window w)<br> >=C2=A0 =C2=A0(set-buffer b)<br> >=C2=A0 =C2=A0(erase-buffer)<br> >=C2=A0 =C2=A0(cl-dotimes (i (* l 2))<br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(insert "fo= o\n"))<br> >=C2=A0 =C2=A0(goto-char (point-min))<br> >=C2=A0 =C2=A0(forward-line (+ l 2))<br> >=C2=A0 =C2=A0(setq o (make-overlay (point) (point)))<br> >=C2=A0 =C2=A0(overlay-put o 'after-string "\n")<br> >=C2=A0 =C2=A0(goto-char (point-max))<br> >=C2=A0 =C2=A0(recenter -1))<br> ><br> ><br> > That is, if there is a multi-line overlay that would be shown only<br> > halfway.<br> <br> I'm not sure I understand: are you trying to display a window whose<br> start point is in the middle of an overlay string?=C2=A0 That's not<br> possible, AFAIK.=C2=A0 The window-start point must be a buffer position.<br= > </blockquote></div> --001a113f17d6723f3e052ebc82d8--
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
Full text available.Received: (at 23098) by debbugs.gnu.org; 23 Mar 2016 19:18:40 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Mar 23 15:18:40 2016 Received: from localhost ([127.0.0.1]:34761 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aioIi-0002gG-8e for submit <at> debbugs.gnu.org; Wed, 23 Mar 2016 15:18:40 -0400 Received: from eggs.gnu.org ([208.118.235.92]:53704) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1aioIg-0002g3-42 for 23098 <at> debbugs.gnu.org; Wed, 23 Mar 2016 15:18:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1aioIX-000211-23 for 23098 <at> debbugs.gnu.org; Wed, 23 Mar 2016 15:18:33 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=BAYES_20,T_RP_MATCHES_RCVD autolearn=disabled version=3.3.2 Received: from fencepost.gnu.org ([2001:4830:134:3::e]:56964) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1aioIW-00020x-Us; Wed, 23 Mar 2016 15:18:28 -0400 Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:2371 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1aioIV-0002mU-99; Wed, 23 Mar 2016 15:18:28 -0400 Date: Wed, 23 Mar 2016 21:18:10 +0200 Message-Id: <83d1ql2ebx.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Jorgen Schaefer <jorgen.schaefer@HIDDEN> In-reply-to: <87r3f19gx0.fsf@HIDDEN> (message from Jorgen Schaefer on Wed, 23 Mar 2016 19:40:27 +0100) Subject: Re: bug#23098: 25.0.92; (recenter -1) can leave point in the middle of the window References: <87r3f19gx0.fsf@HIDDEN> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: 23098 Cc: 23098 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: Eli Zaretskii <eliz@HIDDEN> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.0 (-----) > From: Jorgen Schaefer <jorgen.schaefer@HIDDEN> > Date: Wed, 23 Mar 2016 19:40:27 +0100 > > Evaluating the following code in "emacs -Q" leaves point in the middle > of the window, instead of at the end of the window as expected. Certain > modes (IRC) want to keep the buffer flushed at the end of the window, > this problem interferes with that behavior and causes very weird jumpy > scrolling. > > > (require 'cl) > (let* ((b (get-buffer-create "*Bug Repro*")) > (w (selected-window)) > (l (window-height w)) > o) > (set-window-buffer w b) > (select-window w) > (set-buffer b) > (erase-buffer) > (cl-dotimes (i (* l 2)) > (insert "foo\n")) > (goto-char (point-min)) > (forward-line (+ l 2)) > (setq o (make-overlay (point) (point))) > (overlay-put o 'after-string "\n") > (goto-char (point-max)) > (recenter -1)) > > > That is, if there is a multi-line overlay that would be shown only > halfway. I'm not sure I understand: are you trying to display a window whose start point is in the middle of an overlay string? That's not possible, AFAIK. The window-start point must be a buffer position.
bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
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Hello!
Evaluating the following code in "emacs -Q" leaves point in the middle
of the window, instead of at the end of the window as expected. Certain
modes (IRC) want to keep the buffer flushed at the end of the window,
this problem interferes with that behavior and causes very weird jumpy
scrolling.
(require 'cl)
(let* ((b (get-buffer-create "*Bug Repro*"))
(w (selected-window))
(l (window-height w))
o)
(set-window-buffer w b)
(select-window w)
(set-buffer b)
(erase-buffer)
(cl-dotimes (i (* l 2))
(insert "foo\n"))
(goto-char (point-min))
(forward-line (+ l 2))
(setq o (make-overlay (point) (point)))
(overlay-put o 'after-string "\n")
(goto-char (point-max))
(recenter -1))
That is, if there is a multi-line overlay that would be shown only
halfway.
I have seen similar behavior with some forms of invisible text, but have
not been able to create reproduction steps for that.
Regards,
Jorgen
In GNU Emacs 25.0.92.1 (x86_64-unknown-linux-gnu)
of 2016-03-14 built on loki.jorgenschaefer.de
Repository revision: 1b9d6163b023aaefd15d38ea28e968a113202402
System Description: Debian GNU/Linux 8.3 (jessie)
Configured using:
'configure --enable-checking --without-x 'CFLAGS=-ggdb3 -O0'
LDFLAGS=-ggdb3'
Jorgen Schaefer <jorgen.schaefer@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#23098; Package emacs.
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