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Date: Mon, 21 Mar 2016 17:58:45 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Nick Helm <nick@HIDDEN>
In-reply-to: <m2y49cscip.fsf@HIDDEN> (message from Nick Helm on Mon,
21 Mar 2016 17:03:42 +1300)
Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used
References: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN>
<m2y49cscip.fsf@HIDDEN>
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> From: Nick Helm <nick@HIDDEN>
> Date: Mon, 21 Mar 2016 17:03:42 +1300
>
> Could the EOL cursor-height be set to the height of the tallest glyph in the
> line?
I don't think your problem is the height of the cursor. I think your
problem is the vertical position of the lower edge of the cursor
block. You should keep in mind that a glyph can (and normally does)
rise above the base line of the display line, but it can also descent
below that base line. So the height alone does not determine the
cursor appearance, unless you also specify the vertical position of
its lower edge.
But to answer your question: we already do that, in a way. The
display engine records the maximum vertical dimensions of the glyphs
in a display line as it lays out each line. The EOL cursor simply
uses these maximum values, both the max ascent value and the max
descent value; the latter includes the line spacing.
> In Emacs 24, my understanding is that cursor-height = line-height, where
> line-height was determined by adding the height of the tallest glyph in the line
> to the top and bottom vertical spacing.
No, Emacs 24 didn't use the height of the tallest glyph. It didn't
even track the height of individual glyphs. Instead, it used a single
global value of height specified by the font. Some fonts specify very
large value there, so this was changed to provide a better display. I
explained this up-thread, see
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21835#8
> Alternatively, how about setting the EOL cursor-height to the same height as the
> last *displayable* glyph in the line, but with a lower size boundary?
Tried that, it gave much worse results when the last glyph is very
small -- a surprisingly frequent situation, because some fonts have
their SPC glyph specify a small height. Limitation from below doesn't
work because there are display features, such as the 'line-height'
property, that become broken by such limitations.
And then there are empty lines, of course.
> If there are
> no displayable glyphs in the line or the line is empty, could the height of the
> closest previous displayable glyph be used, even if it's on an earlier line? If
> the buffer is empty or contains no displayable glyphs, use (default line-height
> -
> line-spacing).
This would slow down redisplay in many important cases, because
redisplay optimizations frequently cause Emacs to lay out a single
display line. What you suggest would require searching for the last
non-empty line followed by costly layout of that line (to determine
its height) even though that line doesn't need to be redrawn at all.
The case of the empty line is actually one of the main reasons for the
current behavior: we want the cursor on an empty line look the same as
the EOL cursor on a non-empty line, and we want to do that without
examining the glyphs of any other display lines.
The other gotcha is to make sure the hollow cursor, drawn by default
in non-selected windows, will have the same dimensions as the block
cursor on the same character, otherwise switching to a different
window will have unpleasant effect. These two cursors are drawn using
2 very different methods, so there be dragons.
Anyway, you (or anyone else) are welcome to try different ideas for
making the display of EOL cursor better, the relevant function is
append_space_for_newline in xdisp.c. Just make sure you cover all the
use cases uncovered by the various bugs referenced in the commits that
changed the code of this function in the past ("git log -L" will show
them).
> If none of that's possible or causes more grief than it's worth, how about also
> letting the user arbitrarily set the cursor height?
I think you can do that already by customizing cursor-type to
'(hbar . N)' where N is some suitable number that produces the cursor
you like.
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
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24:XdWAfdhFm2VnauRpNcCjCi5CDV0yF4t59hlqdT9bORqb3rgziWcCVdZV0M3a1gSV44EN0toab7bXGK7uEDQ5uOgrB+ehgpNb46Zc38m83ls= SpamDiagnosticOutput: 1:23 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: tenpoint.co.nz X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Mar 2016 04:03:48.5625 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: MEXPR01MB0277 X-Spam-Score: -1.0 (-) X-Debbugs-Envelope-To: 21835 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: -1.0 (-) I also have set line-spacing in my init.el. I like how the size of the cursor now reflects the size of the glyph under point - it avoids many of the problems of badly designed typefaces. However, I also find the changing EOL cursor-height size between line-body and line-end quite jarring while writing and editing. Could the EOL cursor-height be set to the height of the tallest glyph in the line? In Emacs 24, my understanding is that cursor-height = line-height, where line-height was determined by adding the height of the tallest glyph in the line to the top and bottom vertical spacing. This is the same, just without the spacing. Alternatively, how about setting the EOL cursor-height to the same height as the last *displayable* glyph in the line, but with a lower size boundary? If there are no displayable glyphs in the line or the line is empty, could the height of the closest previous displayable glyph be used, even if it's on an earlier line? If the buffer is empty or contains no displayable glyphs, use (default line-height - line-spacing). If none of that's possible or causes more grief than it's worth, how about also letting the user arbitrarily set the cursor height? There'd need to be some boundaries, perhaps a percentage of line-height, but this might also work well for some people and fonts.
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
Full text available.Received: (at 21835) by debbugs.gnu.org; 6 Nov 2015 14:29:00 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Nov 06 09:29:00 2015 Received: from localhost ([127.0.0.1]:55351 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1Zui0h-000448-Nc for submit <at> debbugs.gnu.org; Fri, 06 Nov 2015 09:29:00 -0500 Received: from mtaout29.012.net.il ([80.179.55.185]:32949) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eliz@HIDDEN>) id 1Zui0K-00043Z-MT for 21835 <at> debbugs.gnu.org; Fri, 06 Nov 2015 09:28:56 -0500 Received: from conversion-daemon.mtaout29.012.net.il by mtaout29.012.net.il (HyperSendmail v2007.08) id <0NXE00100D41ML00@HIDDEN> for 21835 <at> debbugs.gnu.org; Fri, 06 Nov 2015 16:27:55 +0200 (IST) Received: from HOME-C4E4A596F7 ([84.94.185.246]) by mtaout29.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NXE00MYDDII2C40@HIDDEN>; Fri, 06 Nov 2015 16:27:55 +0200 (IST) Date: Fri, 06 Nov 2015 16:28:26 +0200 From: Eli Zaretskii <eliz@HIDDEN> Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used In-reply-to: <jwvh9kzgqze.fsf-monnier+bug#21835@HIDDEN> X-012-Sender: halo1@HIDDEN To: Stefan Monnier <monnier@HIDDEN> Message-id: <83wptvqk1h.fsf@HIDDEN> References: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN> <831tc4togq.fsf@HIDDEN> <jwvh9kzgqze.fsf-monnier+bug#21835@HIDDEN> X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: 21835 Cc: david.reitter@HIDDEN, 21835 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Eli Zaretskii <eliz@HIDDEN> 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: 1.0 (+) > From: Stefan Monnier <monnier@HIDDEN> > Cc: David Reitter <david.reitter@HIDDEN>, 21835 <at> debbugs.gnu.org > Date: Fri, 06 Nov 2015 09:10:32 -0500 > > >> Result: cursor is displayed with wrong (large, two-line) height when at > >> the end of a line, and correctly when not at the end of a line. > > Strange as it might sound, this is not a bug, but intended behavior. > > I think including the line-spacing in the cursor's height is not > "intended". Intended by me, I meant. IOW, that's what the code I wrote was supposed to do. Sorry for being unclear.
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From: Stefan Monnier <monnier@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used
Message-ID: <jwvh9kzgqze.fsf-monnier+bug#21835@HIDDEN>
References: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN>
<831tc4togq.fsf@HIDDEN>
Date: Fri, 06 Nov 2015 09:10:32 -0500
In-Reply-To: <831tc4togq.fsf@HIDDEN> (Eli Zaretskii's message of "Thu, 05 Nov
2015 18:12:21 +0200")
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>> Result: cursor is displayed with wrong (large, two-line) height when at
>> the end of a line, and correctly when not at the end of a line.
> Strange as it might sound, this is not a bug, but intended behavior.
I think including the line-spacing in the cursor's height is not
"intended". At least, it seems to be a clear bug (can't think of
a case where it would be a good idea).
Maybe it's not easy to fix it (and/or not super important), of course.
Stefan
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
Full text available.Received: (at 21835) by debbugs.gnu.org; 6 Nov 2015 09:32:09 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Nov 06 04:32:09 2015 Received: from localhost ([127.0.0.1]:55273 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ZudNR-0003BG-AF for submit <at> debbugs.gnu.org; Fri, 06 Nov 2015 04:32:09 -0500 Received: from mtaout29.012.net.il ([80.179.55.185]:59745) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eliz@HIDDEN>) id 1ZudN7-0003AQ-A3 for 21835 <at> debbugs.gnu.org; Fri, 06 Nov 2015 04:32:08 -0500 Received: from conversion-daemon.mtaout29.012.net.il by mtaout29.012.net.il (HyperSendmail v2007.08) id <0NXD00L00ZMZKJ00@HIDDEN> for 21835 <at> debbugs.gnu.org; Fri, 06 Nov 2015 11:31:07 +0200 (IST) Received: from HOME-C4E4A596F7 ([84.94.185.246]) by mtaout29.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NXD00HDUZRVH340@HIDDEN>; Fri, 06 Nov 2015 11:31:07 +0200 (IST) Date: Fri, 06 Nov 2015 11:31:38 +0200 From: Eli Zaretskii <eliz@HIDDEN> Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used In-reply-to: <C916CD55-4F19-4DAC-85CB-F38C270D893C@HIDDEN> X-012-Sender: halo1@HIDDEN To: David Reitter <david.reitter@HIDDEN> Message-id: <83d1vnsccl.fsf@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 8BIT References: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN> <831tc4togq.fsf@HIDDEN> <C916CD55-4F19-4DAC-85CB-F38C270D893C@HIDDEN> X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: 21835 Cc: 21835 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Eli Zaretskii <eliz@HIDDEN> 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: 1.0 (+) > From: David Reitter <david.reitter@HIDDEN> > Date: Thu, 5 Nov 2015 22:12:03 -0500 > Cc: 21835 <at> debbugs.gnu.org > > >> (setq line-spacing 1.0) > >> > >> (Note how the display doesn’t update, so enter C-l to force it) > > > > It does update for me if I evaluate that with C-j at the right > > parenthesis. How did you evaluate it? > > C-x C-e. > C-j, indeed, updates the display. Thanks. This was a regression since Emacs 24.4, now fixed. (C-j modifies the current buffer, so it caused redisplay of the selected window, but "C-x C-e" only caused the echo area to be redisplayed.)
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
Full text available.Received: (at 21835) by debbugs.gnu.org; 6 Nov 2015 08:15:42 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Nov 06 03:15:42 2015 Received: from localhost ([127.0.0.1]:55244 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ZucBR-0001Bn-J7 for submit <at> debbugs.gnu.org; Fri, 06 Nov 2015 03:15:41 -0500 Received: from mtaout25.012.net.il ([80.179.55.181]:55103) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eliz@HIDDEN>) id 1ZucB5-0001BE-Vh for 21835 <at> debbugs.gnu.org; Fri, 06 Nov 2015 03:15:39 -0500 Received: from conversion-daemon.mtaout25.012.net.il by mtaout25.012.net.il (HyperSendmail v2007.08) id <0NXD00700VZQP900@HIDDEN> for 21835 <at> debbugs.gnu.org; Fri, 06 Nov 2015 10:13:01 +0200 (IST) Received: from HOME-C4E4A596F7 ([84.94.185.246]) by mtaout25.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NXD00656W5P1R20@HIDDEN>; Fri, 06 Nov 2015 10:13:01 +0200 (IST) Date: Fri, 06 Nov 2015 10:15:09 +0200 From: Eli Zaretskii <eliz@HIDDEN> Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used In-reply-to: <C916CD55-4F19-4DAC-85CB-F38C270D893C@HIDDEN> X-012-Sender: halo1@HIDDEN To: David Reitter <david.reitter@HIDDEN> Message-id: <83fv0jsfw2.fsf@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 8BIT References: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN> <831tc4togq.fsf@HIDDEN> <C916CD55-4F19-4DAC-85CB-F38C270D893C@HIDDEN> X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: 21835 Cc: 21835 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Eli Zaretskii <eliz@HIDDEN> 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: 1.0 (+) > From: David Reitter <david.reitter@HIDDEN> > Date: Thu, 5 Nov 2015 22:12:03 -0500 > Cc: 21835 <at> debbugs.gnu.org > > One could default to the height of the last glyph of the line. Normally, we would expect the size of the cursor to indicate the general height of the text that would be inserted there, and the last glyph is the best guess. I tried that, and it was worse. The problem is, the last glyph could have very small height, at least with some fonts. Then you have a very small cursor at the end. What's more, as you type at EOL, the cursor height will constantly change. > Alternatively, use the line height for all cursor positions in that line. In that case, things would still need to be adjusted for `line-spacing’, and based on what you wrote, I think that’s less preferable. Indeed. Our cursor, when it is drawn on a character, shows the dimensions of that character, both horizontal and vertical. Losing that, even only for the vertical dimension, would be a step backward, I think. There are also differences in how we draw the hollow cursor (in non-selected windows) vs the cursor in selected windows. They should have the same dimensions, or else it will look like a bug. The solution I coded solves this problem as well (some other ideas didn't). So once again, I don't know of any better way of solving this.
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
Full text available.Received: (at 21835) by debbugs.gnu.org; 6 Nov 2015 03:12:26 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Nov 05 22:12:26 2015 Received: from localhost ([127.0.0.1]:55159 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ZuXRy-0002Bd-7E for submit <at> debbugs.gnu.org; Thu, 05 Nov 2015 22:12:26 -0500 Received: from mail-qg0-f47.google.com ([209.85.192.47]:35234) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <david.reitter@HIDDEN>) id 1ZuXRd-0002B7-WB for 21835 <at> debbugs.gnu.org; Thu, 05 Nov 2015 22:12:24 -0500 Received: by qgec40 with SMTP id c40so22071129qge.2 for <21835 <at> debbugs.gnu.org>; Thu, 05 Nov 2015 19:12:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=B82+I6xOP4xR93xkag+ocdN7aBzPc5VUWaT+4BBVvaY=; b=ycdiENCpfoRFPitnF4SxikLpbMP8wODF2W+2ZueszPN/a1PPoUKPAwM5DNQQrsd1z/ viz4CiV//yxCiX6DTWvk1R83zI4kjFtsoRhxU6cxkernposwt8umYd9EgDYMzPHFRrvw lVH42hgaHAwGfziIslx3tJEsWi7FoIdqCi5srX//aJLfxlOiusnR9qlLI6N27hlhkssH mpDajsYzrG/eKFyd2nA/M9OI9q806AA0dDQHx/9FtOgCygvAX+BkUkYR6IDlVH73Mbhe X+pVT4esrbjWMM6TTWnOvlHUHZQ0Ny4v/HeCRic9Z4c+FkmFGG9eEIVWKlNMdIDIR6xD 0pQA== X-Received: by 10.140.254.193 with SMTP id z184mr11923990qhc.68.1446779525418; Thu, 05 Nov 2015 19:12:05 -0800 (PST) Received: from [10.0.1.23] (c-71-58-212-112.hsd1.pa.comcast.net. [71.58.212.112]) by smtp.gmail.com with ESMTPSA id d65sm2434126qhc.36.2015.11.05.19.12.04 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 05 Nov 2015 19:12:04 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.0 \(3094\)) Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used From: David Reitter <david.reitter@HIDDEN> In-Reply-To: <831tc4togq.fsf@HIDDEN> Date: Thu, 5 Nov 2015 22:12:03 -0500 Content-Transfer-Encoding: quoted-printable Message-Id: <C916CD55-4F19-4DAC-85CB-F38C270D893C@HIDDEN> References: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN> <831tc4togq.fsf@HIDDEN> To: Eli Zaretskii <eliz@HIDDEN> X-Mailer: Apple Mail (2.3094) X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 21835 Cc: 21835 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 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 (/) Hi Eli, On Nov 5, 2015, at 11:12 AM, Eli Zaretskii <eliz@HIDDEN> wrote: >> (setq line-spacing 1.0) >>=20 >> (Note how the display doesn=E2=80=99t update, so enter C-l to force = it) >=20 > It does update for me if I evaluate that with C-j at the right > parenthesis. How did you evaluate it? C-x C-e. =20 C-j, indeed, updates the display. > Strange as it might sound, this is not a bug, but intended behavior. > It is a consequence of improvements in display code that avoid > extremely large lines with some fonts (in particular, math fonts) that > declare preposterously large font sizes. Previously, the line height, > and the height of the cursor at EOL, was determined by the font-global > ascent/descent values. We now determine the height of the line by > looking at the glyphs we actually display on that line. See bug#20628 > for more details. That, in principle, should not be a problem - if you indeed determine a = line height rather than a glyph height (at the cursor) and use that for = the cursor anywhere in that line. But... > The problem with displaying the cursor at the end of the line is that > there's no displayable glyph there, whose dimensions in the font we > could use to determine the cursor height. So we set the cursor height > to the line height. That creates an inconsistency, and it looks bad. =20 So, you=E2=80=99re asking, what did I have in mind? One could default to the height of the last glyph of the line. Normally, = we would expect the size of the cursor to indicate the general height of = the text that would be inserted there, and the last glyph is the best = guess. Alternatively, use the line height for all cursor positions in that = line. In that case, things would still need to be adjusted for = `line-spacing=E2=80=99, and based on what you wrote, I think that=E2=80=99= s less preferable.=
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
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Date: Thu, 05 Nov 2015 18:12:21 +0200
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#21835: 25.0.50; cursor height wrong when line-spacing is used
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> From: David Reitter <david.reitter@HIDDEN>
> Date: Wed, 4 Nov 2015 23:21:13 -0500
>
> Start Emacs 25 (master branch) (with -Q if you like)
>
> (setq line-spacing 1.0)
>
> (Note how the display doesn’t update, so enter C-l to force it)
It does update for me if I evaluate that with C-j at the right
parenthesis. How did you evaluate it?
> Result: cursor is displayed with wrong (large, two-line) height when at the end of a line, and correctly when not at the end of a line.
Strange as it might sound, this is not a bug, but intended behavior.
It is a consequence of improvements in display code that avoid
extremely large lines with some fonts (in particular, math fonts) that
declare preposterously large font sizes. Previously, the line height,
and the height of the cursor at EOL, was determined by the font-global
ascent/descent values. We now determine the height of the line by
looking at the glyphs we actually display on that line. See bug#20628
for more details.
The problem with displaying the cursor at the end of the line is that
there's no displayable glyph there, whose dimensions in the font we
could use to determine the cursor height. So we set the cursor height
to the line height.
> This wasn’t the case in Emacs 24.
Yes, the changes to use the glyph metrics are new in Emacs 25.
> Also note bug#17977
That's unrelated to this issue, AFAICS. That bug is NS specific,
whereas what you describe happens on all supported GUI frames.
> In any case, the cursor’s height should not change.
When you say "should not change", what do you have in mind? Should
not change from what value? If you think that the value of the cursor
height is fixed when it is displayed on other characters of the line,
then this is not so, unfortunately.
Please keep in mind that characters on a line can have different
dimensions, even if they come from the same font, let alone if they
come from different fonts (which happens quite a lot in Emacs, given
today's abundance of rare characters in plain text). When the cursor
is displayed on a character, it gets its dimensions from that
character (you can see the effect of that if you display a line where
some characters come from a larger font). But that doesn't work when
the cursor is at the end of a line, where there's no character to
begin with. So we use the line's height instead. I agree that the
result looks somewhat ugly, especially when the value of line-spacing
is large. Suggestions for better defaults are welcome; at the time, I
tried several other ideas, but they all had worse problems.
> If it has to be this high the actual text line should be vertically
> centered.
We cannot do that without changing how line-spacing is applied. Since
Emacs 21.1, when this feature was added, we always added the spacing
_below_ each line. The ELisp manual documents this:
You can specify the line spacing for all lines in a buffer via the
buffer-local ‘line-spacing’ variable. An integer specifies the number
of pixels put below lines. A floating-point number specifies the
spacing relative to the default frame line height.
and elsewhere:
‘line-spacing’
Additional space to leave below each text line, in pixels (a
positive integer).
(Note the "below" parts in both excerpts.)
I personally never use these features, so I don't object to changing
the effect of line-spacing to have it distributes between the ascent
and descent parts somehow. Not sure what others will say. In any
case, doing this will require non-trivial changes to display code.
Thanks.
bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
Full text available.Received: (at submit) by debbugs.gnu.org; 5 Nov 2015 04:21:43 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Nov 04 23:21:42 2015 Received: from localhost ([127.0.0.1]:53957 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ZuC3S-0002lm-0c for submit <at> debbugs.gnu.org; Wed, 04 Nov 2015 23:21:42 -0500 Received: from eggs.gnu.org ([208.118.235.92]:39463) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <david.reitter@HIDDEN>) id 1ZuC37-0002l9-MV for submit <at> debbugs.gnu.org; Wed, 04 Nov 2015 23:21:40 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <david.reitter@HIDDEN>) id 1ZuC36-0003Dc-4O for submit <at> debbugs.gnu.org; Wed, 04 Nov 2015 23:21:21 -0500 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,FREEMAIL_FROM, HTML_MESSAGE,T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:36108) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <david.reitter@HIDDEN>) id 1ZuC36-0003DY-0T for submit <at> debbugs.gnu.org; Wed, 04 Nov 2015 23:21:20 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49469) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <david.reitter@HIDDEN>) id 1ZuC34-0002J8-7s for bug-gnu-emacs@HIDDEN; Wed, 04 Nov 2015 23:21:19 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <david.reitter@HIDDEN>) id 1ZuC31-0003DI-0d for bug-gnu-emacs@HIDDEN; Wed, 04 Nov 2015 23:21:18 -0500 Received: from mail-qk0-x243.google.com ([2607:f8b0:400d:c09::243]:33235) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <david.reitter@HIDDEN>) id 1ZuC30-0003DC-PM for bug-gnu-emacs@HIDDEN; Wed, 04 Nov 2015 23:21:14 -0500 Received: by qkcn129 with SMTP id n129so3716221qkc.0 for <bug-gnu-emacs@HIDDEN>; Wed, 04 Nov 2015 20:21:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:content-type:subject:message-id:date:to:mime-version; bh=bFlPZ8Hj9/yOZsuUoEfODDrndB3Bl8oinE+jUin43cU=; b=FoyduZZZYnQdCQ82zlyBDwewYoUveKtqcfoFp7HVh2LvlHq23CaXMEjyfE2WD4bZry hbZ2SMSJC7fP5t6CIm67RXabS9JQKOScJeFwmjQM9W47G8gRm4D9MH68ZQJSnfJ9/ep8 lGeNbhUetgfSSU8Mo1Q2/mlkStL7DwrIZTZtd1wCsloK7JKMeFeErcIwDKsZyAJWJzB4 fDYabYAI2i7/4YEldnqO7WwVO5oy11XVzsF94dP8TMkcBqhYFE11dxp29J9EbfhgaCUv GMfTRhb8gACbg0HhK1iwgijRWFi0Fyn7fXNMev8KrRKzK4LuLZth5VrUfFjp4D32SwiM jsYA== X-Received: by 10.55.71.203 with SMTP id u194mr5175804qka.14.1446697273413; Wed, 04 Nov 2015 20:21:13 -0800 (PST) Received: from [10.0.1.23] (c-71-58-212-112.hsd1.pa.comcast.net. [71.58.212.112]) by smtp.gmail.com with ESMTPSA id s48sm1205599qgs.4.2015.11.04.20.21.11 for <bug-gnu-emacs@HIDDEN> (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 04 Nov 2015 20:21:12 -0800 (PST) From: David Reitter <david.reitter@HIDDEN> Content-Type: multipart/alternative; boundary="Apple-Mail=_D807D1AF-B925-4C72-9478-6531C641D187" Subject: 25.0.50; cursor height wrong when line-spacing is used Message-Id: <B5C62293-85C4-4F7F-BFF2-4B8A031AAD48@HIDDEN> Date: Wed, 4 Nov 2015 23:21:13 -0500 To: bug-gnu-emacs@HIDDEN Mime-Version: 1.0 (Mac OS X Mail 9.0 \(3094\)) X-Mailer: Apple Mail (2.3094) X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 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: -4.0 (----) --Apple-Mail=_D807D1AF-B925-4C72-9478-6531C641D187 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Start Emacs 25 (master branch) (with -Q if you like) (setq line-spacing 1.0) (Note how the display doesn=E2=80=99t update, so enter C-l to force it) Result: cursor is displayed with wrong (large, two-line) height when at = the end of a line, and correctly when not at the end of a line. Works similarly with different cursor types. This wasn=E2=80=99t the case in Emacs 24. Also note bug#17977, although I disagree about the reporter=E2=80=99s = preferences. In any case, the cursor=E2=80=99s height should not = change. If it has to be this high, the actual text line should be = vertically centered. In GNU Emacs 25.0.50.1 (x86_64-apple-darwin15.0.0, NS appkit-1404.11 = Version 10.11 (Build 15A284)) of 2015-11-04 Repository revision: 5401bb8645f955b6fde8c0a5e5c8cf5ec1cab626 Windowing system distributor 'Apple', version 10.3.1404 Configured using: 'configure 'CFLAGS=3D-O3 -g'' Configured features: RSVG DBUS ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Lisp Interaction Minor modes in effect: which-function-mode: t tooltip-mode: t global-eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent messages: .emacs: (lambda (x) ...) quoted with ' rather than with #' [2 times] For information about GNU Emacs and the GNU system, type C-h C-a. 1.0 next-line: End of buffer [2 times] Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message dired format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr mail-utils warnings ghostedit ghostedit-stopwords-en easy-mmode which-func imenu time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel ns-win term/common-win tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote dbusbind cocoa ns multi-tty make-network-process emacs) Memory information: ((conses 16 87331 6412) (symbols 48 19011 0) (miscs 40 49 232) (strings 32 16448 5934) (string-bytes 1 461013) (vectors 16 10826) (vector-slots 8 452328 5852) (floats 8 156 200) (intervals 56 221 6) (buffers 976 12)) --Apple-Mail=_D807D1AF-B925-4C72-9478-6531C641D187 Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_1594F6E2-966D-4648-96C1-1E7FBEEBE7F0" --Apple-Mail=_1594F6E2-966D-4648-96C1-1E7FBEEBE7F0 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div = class=3D"">Start Emacs 25 (master branch) (with -Q if you = like)</div><div class=3D""><br class=3D""></div><div class=3D"">(setq = line-spacing 1.0)</div><div class=3D""><br class=3D""></div><div = class=3D""><br class=3D""></div><div class=3D"">(Note how the display = doesn=E2=80=99t update, so enter C-l to force it)</div><div class=3D""><br= class=3D""></div><div class=3D""><br class=3D""></div><div = class=3D"">Result: cursor is displayed with wrong (large, two-line) = height when at the end of a line, and correctly when not at the end of a = line.</div><div class=3D""><br class=3D""></div><div class=3D"">Works = similarly with different cursor types.</div><div class=3D""><br = class=3D""></div><div class=3D"">This wasn=E2=80=99t the case in Emacs = 24.</div><div class=3D""><br class=3D""></div><div class=3D"">Also note = bug#17977, although I disagree about the reporter=E2=80=99s preferences. = In any case, the cursor=E2=80=99s height should not change. = If it has to be this high, the actual text line should be = vertically centered.</div><div class=3D""><br class=3D""></div><div = class=3D""><br class=3D""></div><div class=3D""><img apple-inline=3D"yes" = id=3D"B2B11ECA-E4B4-4D92-B557-2D6EA6E612A9" height=3D"91" width=3D"93" = apple-width=3D"yes" apple-height=3D"yes" = src=3D"cid:E2C7B9B8-5C17-4ABA-8F30-DCCEA933FB68" class=3D""></div><div = class=3D""><img apple-inline=3D"yes" = id=3D"C2F768AF-A9F2-4263-BDA3-5D7000A62205" height=3D"100" width=3D"124" = apple-width=3D"yes" apple-height=3D"yes" = src=3D"cid:BF611EFA-73B6-4C79-BDCA-6FA95E4D7820" class=3D""></div><div = class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><br = class=3D"">In GNU Emacs 25.0.50.1 (x86_64-apple-darwin15.0.0, NS = appkit-1404.11 Version 10.11 (Build 15A284))<br class=3D""> of = 2015-11-04<br class=3D"">Repository revision: = 5401bb8645f955b6fde8c0a5e5c8cf5ec1cab626<br class=3D"">Windowing system = distributor 'Apple', version 10.3.1404<br class=3D"">Configured = using:<br class=3D""> 'configure 'CFLAGS=3D-O3 -g''<br class=3D""><br= class=3D"">Configured features:<br class=3D"">RSVG DBUS ACL LIBXML2 = ZLIB TOOLKIT_SCROLL_BARS NS<br class=3D""><br class=3D"">Important = settings:<br class=3D""> value of $LANG: en_US.UTF-8<br = class=3D""> locale-coding-system: utf-8-unix<br class=3D""><br = class=3D"">Major mode: Lisp Interaction<br class=3D""><br class=3D"">Minor= modes in effect:<br class=3D""> which-function-mode: t<br = class=3D""> tooltip-mode: t<br class=3D""> = global-eldoc-mode: t<br class=3D""> electric-indent-mode: t<br = class=3D""> mouse-wheel-mode: t<br class=3D""> = tool-bar-mode: t<br class=3D""> menu-bar-mode: t<br = class=3D""> file-name-shadow-mode: t<br class=3D""> = global-font-lock-mode: t<br class=3D""> font-lock-mode: t<br = class=3D""> blink-cursor-mode: t<br class=3D""> = auto-composition-mode: t<br class=3D""> auto-encryption-mode: t<br = class=3D""> auto-compression-mode: t<br class=3D""> = line-number-mode: t<br class=3D""> transient-mark-mode: t<br = class=3D""><br class=3D"">Recent messages:<br class=3D"">.emacs: (lambda = (x) ...) quoted with ' rather than with #' [2 times]<br class=3D"">For = information about GNU Emacs and the GNU system, type C-h C-a.<br = class=3D"">1.0<br class=3D"">next-line: End of buffer [2 times]<br = class=3D""><br class=3D"">Load-path shadows:<br class=3D"">None = found.<br class=3D""><br class=3D"">Features:<br class=3D"">(shadow sort = gnus-util mail-extr emacsbug message dired format-spec<br = class=3D"">rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse = rfc2231<br class=3D"">mailabbrev gmm-utils mailheader sendmail rfc2047 = rfc2045 ietf-drums<br class=3D"">mm-util help-fns help-mode easymenu = cl-loaddefs pcase cl-lib mail-prsvr<br class=3D"">mail-utils warnings = ghostedit ghostedit-stopwords-en easy-mmode<br class=3D"">which-func = imenu time-date mule-util tooltip eldoc electric uniquify<br = class=3D"">ediff-hook vc-hooks lisp-float-type mwheel ns-win = term/common-win<br class=3D"">tool-bar dnd fontset image regexp-opt = fringe tabulated-list newcomment<br class=3D"">elisp-mode lisp-mode = prog-mode register page menu-bar rfn-eshadow timer<br class=3D"">select = scroll-bar mouse jit-lock font-lock syntax facemenu font-core<br = class=3D"">frame cl-generic cham georgian utf-8-lang misc-lang = vietnamese tibetan<br class=3D"">thai tai-viet lao korean japanese = eucjp-ms cp51932 hebrew greek romanian<br class=3D"">slovak czech = european ethiopic indian cyrillic chinese charscript<br = class=3D"">case-table epa-hook jka-cmpr-hook help simple abbrev = minibuffer<br class=3D"">cl-preloaded nadvice loaddefs button faces = cus-face macroexp files<br class=3D"">text-properties overlay sha1 md5 = base64 format env code-pages mule<br class=3D"">custom widget = hashtable-print-readable backquote dbusbind cocoa ns<br = class=3D"">multi-tty make-network-process emacs)<br class=3D""><br = class=3D"">Memory information:<br class=3D"">((conses 16 87331 6412)<br = class=3D""> (symbols 48 19011 0)<br class=3D""> (miscs 40 49 = 232)<br class=3D""> (strings 32 16448 5934)<br = class=3D""> (string-bytes 1 461013)<br class=3D""> (vectors 16 = 10826)<br class=3D""> (vector-slots 8 452328 5852)<br = class=3D""> (floats 8 156 200)<br class=3D""> (intervals 56 = 221 6)<br class=3D""> (buffers 976 12))<br class=3D""><br = class=3D""></body></html>= --Apple-Mail=_1594F6E2-966D-4648-96C1-1E7FBEEBE7F0 Content-Transfer-Encoding: base64 Content-Disposition: inline; filename=PastedGraphic-6.png Content-Type: image/png; x-unix-mode=0666; name="PastedGraphic-6.png" Content-Id: <E2C7B9B8-5C17-4ABA-8F30-DCCEA933FB68> iVBORw0KGgoAAAANSUhEUgAAALoAAAC2CAYAAABuzJeKAAAMGWlDQ1BJQ0MgUHJvZmlsZQAASImV VwdYU8kWnltSCAktEAEpoTdBepXeBQHpYCMkAUIJIRBU7MiiAmsXEazoCoiCawFkrYhiWwTsdUFE RVkXCzZU3iQBdN1Xvne+b+78OXPOmf+cO3MzA4C8LUsgSEcVAMjg5wjD/b2YsXHxTNIfgAIwIAtI wIzFzhZ4hoUFAyhj/d/l3U2AiPtr5uJY/xz/r6LI4WazAUDCIE7kZLMzID4CAK7OFghzACB0QL3e 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David Reitter <david.reitter@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#21835; Package emacs.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.