bug#15541: 24.3; RTL in visual-line-mode

bug#15541: 24.3; RTL in visual-line-mode

[Boruch Baum]

[-- Attachment #1: Type: text/plain, Size: 2025 bytes --]

When using an RTL language in visual-line-mode + org-mode, a sec
ond dispalyed-line of typing for a paragraph appears ABOVE the prior
dispalyed-line. In other words, the rendering for paragraphs is in
reverse-line order. This does not affect paragraph sequence within a
document, only dispalyed-line sequence within a single paragraph.

 ------------------------------------------------------------

In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.4)
 of 2013-09-26 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:	Debian 7.0 GNU/Linux wheezy/testing

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 'LDFLAGS=-Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Org

Minor modes in effect:
  savehist-mode: t
  shell-dirtrack-mode: t
  tooltip-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  visual-line-mode: t
  transient-mark-mode: t


-- 
hkp://keys.gnupg.net
CA45 09B5 5351 7C11 A9D1  7286 0036 9E45 1595 8BC0



[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 900 bytes --]

bug#15541: 24.3; RTL in visual-line-mode

[Eli Zaretskii]

tags 15541 wontfix
thanks

> Date: Sun, 06 Oct 2013 16:16:45 -0400
> From: Boruch Baum <boruch_baum@gmx.com>
> 
> When using an RTL language in visual-line-mode + org-mode, a sec
> ond dispalyed-line of typing for a paragraph appears ABOVE the prior
> dispalyed-line. In other words, the rendering for paragraphs is in
> reverse-line order. This does not affect paragraph sequence within a
> document, only dispalyed-line sequence within a single paragraph.

This is by design, and can only be fixed by a radical change in the
Emacs display engine and how the bidirectional text is rendered by it
(the reordering needs to be done _after_ a line of text is rendered
for display).

As a workaround, either use hard newlines, to make your lines shorter
than the window width, or set bidi-paragraph-direction in that buffer
to right-to-left (or nil, if some of the paragraphs in that Org buffer
use a predominantly LTR script).