From: Eli Zaretskii <eliz@gnu.org>
To: Yixuan Chen <xuan@xlk.me>
Cc: luangruo@yahoo.com, 73752@debbugs.gnu.org, visuweshm@gmail.com
Subject: bug#73752: 29.4; Ligatures are randomly rendered with extra spaces
Date: Sun, 27 Oct 2024 19:43:55 +0200 [thread overview]
Message-ID: <86cyjl8mqs.fsf@gnu.org> (raw)
In-Reply-To: <6566317e-03bb-4856-9cc8-5e90c2875e44@xlk.me> (message from Yixuan Chen on Sun, 27 Oct 2024 13:39:56 -0400)
> Date: Sun, 27 Oct 2024 13:39:56 -0400
> Cc: visuweshm@gmail.com, luangruo@yahoo.com, 73752@debbugs.gnu.org
> From: Yixuan Chen <xuan@xlk.me>
>
> On 10/27/24 13:27, Eli Zaretskii wrote:
> > Or maybe I don't understand the original problem. The bug report says
> > "extra spaces", but eacg font has its own metrics of the SPC glyph, so
> > highlighting a line with a given face can affect the metrics of the
> > whitespace. Why is this surprising? Or what did I miss?
>
> The problem is that the "space" being rendered is different in the
> following two case:
>
> - if the default font is set to a specific combination of attributes
> (say 16, bold, normal) from start, it renders all the characters with
> one version of spacing. Let's call this version of spacing the
> "expected" spacing,
> - if the default font is some other combination of attributes (say 16,
> regular, normal), and one line is set to the attribute of (16, bold,
> normal). There is a **probability** that this line will render with a
> different version of spacing than the "expected" spacing. In my setup,
> this different spacing is extra wide.
>
> Ultimately, I believe the following should be true: if one line is
> rendered with **the same font face attributes**, it should always be
> rendered in **the same way**, regardless when, where, and how its
> attributes are assigned. This is not the case for emacs right now, and
> thus I consider it a bug.
Sorry, I still don't understand. Your code does
(highlight-lines-matching-regexp (cdr face) (car face))
This potentially shows each line in a different face, and thus can
affect the metrics of the SPC character glyph which is what the
indentation is made of. So why is this a problem, let alone a bug?
next prev parent reply other threads:[~2024-10-27 17:43 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-11 16:18 bug#73752: 29.4; Ligatures are randomly rendered with extra spaces xuan
2024-10-12 8:02 ` Eli Zaretskii
2024-10-12 16:09 ` Yixuan Chen
2024-10-27 10:21 ` Eli Zaretskii
2024-10-27 16:19 ` Visuwesh
2024-10-27 17:19 ` Eli Zaretskii
2024-10-27 17:27 ` Eli Zaretskii
2024-10-27 17:39 ` Yixuan Chen
2024-10-27 17:43 ` Eli Zaretskii [this message]
2024-10-27 17:46 ` Yixuan Chen
2024-10-27 19:14 ` Eli Zaretskii
2024-10-27 19:36 ` Yixuan Chen
2024-10-27 19:44 ` Eli Zaretskii
2024-10-27 19:47 ` Yixuan Chen
2024-10-27 20:11 ` Eli Zaretskii
2024-10-27 19:41 ` Yixuan Chen
2024-10-27 20:07 ` Eli Zaretskii
2024-10-27 20:32 ` Yixuan Chen
2024-10-28 14:25 ` Eli Zaretskii
2024-10-28 14:44 ` Yixuan Chen
2024-10-28 14:47 ` Yixuan Chen
2024-10-28 15:05 ` Eli Zaretskii
2024-10-28 15:20 ` Yixuan Chen
2024-10-28 17:19 ` Eli Zaretskii
2024-10-28 17:26 ` Eli Zaretskii
2024-10-28 17:28 ` Yixuan Chen
2024-10-28 18:41 ` Eli Zaretskii
2024-10-28 4:26 ` Visuwesh
2024-10-28 14:59 ` Eli Zaretskii
2024-10-28 15:24 ` Yixuan Chen
2024-10-28 16:18 ` Visuwesh
2024-10-28 17:13 ` Eli Zaretskii
2024-10-29 10:59 ` Visuwesh
2024-10-29 13:04 ` Eli Zaretskii
2024-10-29 13:54 ` Visuwesh
2024-10-29 14:00 ` Visuwesh
2024-10-29 15:38 ` Eli Zaretskii
2024-10-29 16:46 ` Visuwesh
2024-10-29 17:45 ` Eli Zaretskii
2024-10-30 5:43 ` Visuwesh
2024-10-29 16:51 ` Eli Zaretskii
2024-10-27 17:29 ` Yixuan Chen
2024-10-29 23:14 ` Tim Ruffing
2024-10-30 15:12 ` Eli Zaretskii
2024-10-30 15:45 ` Eli Zaretskii
[not found] ` <mvmikt9zkcq.fsf@suse.de>
2024-10-30 15:47 ` Eli Zaretskii
2024-10-30 17:34 ` Tim Ruffing
2024-10-30 17:46 ` Eli Zaretskii
2024-10-30 18:00 ` Tim Ruffing
2024-10-30 18:57 ` Eli Zaretskii
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