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* bug#3452: 23.0.94; display
@ 2009-06-06  2:48 Chong Yidong
  0 siblings, 0 replies; 16+ messages in thread
From: Chong Yidong @ 2009-06-06  2:48 UTC (permalink / raw)
  To: Kenichi Handa; +Cc: 3452

[-- Attachment #1: Type: text/plain, Size: 590 bytes --]

Richard Stallman <rms@gnu.org> wrote: 

> Visiting the file foo.msg after emacs -Q in a 37-line Linux terminal
> garbles the screen, including the mode line and menu bar.

The problem stems from the character 8237 (#o20055, #x202d),
LEFT-TO-RIGHT OVERRIDE.  For some reason, the composition for this
character screws up line wrapping.

For a simpler test case, see the attached file.  The first line uses
character 8237 and is incorrectly wrapped; the second line uses spaces
and is correctly wrapped.

Handa-san, do you have an idea what the problem might be?  If not, I'll
try to debug.


[-- Attachment #2: foo.txt --]
[-- Type: text/plain, Size: 332 bytes --]

‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭‭AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA

                                                        BBB BBB BBB BBB BBB BBB BBB BBB BBB BBB BBB BBB BBB

^ permalink raw reply	[flat|nested] 16+ messages in thread
* bug#3452: 23.0.94; display
@ 2009-06-07  3:47 Chong Yidong
  2009-06-07  9:16 ` Eli Zaretskii
  2009-06-08  1:51 ` Kenichi Handa
  0 siblings, 2 replies; 16+ messages in thread
From: Chong Yidong @ 2009-06-07  3:47 UTC (permalink / raw)
  To: Kenichi Handa; +Cc: 3452

> The problem stems from the character 8237 (#o20055, #x202d),
> LEFT-TO-RIGHT OVERRIDE.  For some reason, the composition for this
> character screws up line wrapping.

Hi Handa-san, I investigated some more.  Let me know what you think.

The entry for 8237 (#x202d) in char-width-table is 0: that is to say,
char-width-table reports that the composition has zero width.  This is
because of the following code in characters.el:

  (let ((l '((#x0300 . #x036F)
            ...
            (#x202A . #x202E)
            (#xE0001 . #xE01EF))))
    (dolist (elt l)
      (set-char-table-range char-width-table elt 0)))

The function fill_gstring_body in composite.c uses char-width-table.
However, composition_gstring_width for this character, called in
term.c:1830, returns 1.  This inconsistency leads to the bug.

Sure enough, if I do

  (aset char-width-table #x202d 1)

then the screen corruption goes away.

Maybe we should reconsider setting these characters to have zero-width
for char-width-table in characters.el, since fill-gstring-body seems to
handle zero-width compositions poorly.  WDYT?





^ permalink raw reply	[flat|nested] 16+ messages in thread
* bug#3452: 23.0.94; display
@ 2009-06-03  2:53 Richard Stallman
  0 siblings, 0 replies; 16+ messages in thread
From: Richard Stallman @ 2009-06-03  2:53 UTC (permalink / raw)
  To: emacs-pretest-bug

Visiting the file foo.msg after emacs -Q in a 37-line Linux terminal
garbles the screen, including the mode line and menu bar.
I last updated the source on May 26.

begin 666 foo.msg
M6"U3<&%M+5-T871U<SH@3F\L('-C;W)E/2TP+C4@<F5Q=6ER960]-2XP('1E
M<W1S/4%73"Q"05E%4U\P,"P*"49/4D=%1%]20U9$7TA%3$\L34E-15]"05-%
M-C1?3D]?3D%-12Q.3U]214%,7TY!344L"@E354)*14-47T5.0T]$141?5%=)
M0T4@875T;VQE87)N/6YO('9E<G-I;VX],RXQ+C`*1&%T93H@5'5E+"`P,B!*
M=6X@,C`P.2`Q,CHQ,SHS."`K,#,P,`I4;SH@96X@/&$M:6YF;W,M96Y`86EN
M9F]S+F-A/@I-97-S86=E+6ED.B`\-$$R-$5$-#(N-C`T,#0P.$!N971V:7-I
M;VXN;F5T+FEL/@I-24U%+79E<G-I;VXZ(#$N,`I&<F]M.B!A+6EN9F]S+65N
M0&%I;F9O<RYC80I3=6)J96-T.B`H96XI(#T_=71F+3@_<3]#86QL7V9O<E]3
M=6UM97)?;V9?4F5S:7-T86YC93U%,CTX,#U!1%\]13(].#`]04,R,#\]"B`]
M/W5T9BTX/W$_,#D]13(].#`]040J7T-O;&QA<'-E7W1H95]S96-U<FET>5]A
M<F-H:71E8W1U<F5S/44R/3@P/4%$(3\]"B`]/W5T9BTX/V(_-&]#<S\]"E)E
M<&QY+51O.B!A+6EN9F]S+65N0&%I;F9O<RYC80I#;VYT96YT+51Y<&4Z('1E
M>'0O<&QA:6X[(&-H87)S970](G5T9BTX(@H*"D%G86EN<W0@3D%43RP@1S(P
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M@)TA("TM+2T@4VEN8V4@=&AE(&5N9"!O9B!T:&4@"FQA<W0@;6EL;&5N;FEU
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M86YT:6%U=&AO<FET87)I86X@86YT:6-A<&ET86QI<W0@:6YI=&EA=&EV90I?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7PI!("T@
M22!.($8@3R!3("!.($4@5R!3("!3($4@4B!6($D@0R!%"D)Y+"!&;W(L(&%N
M9"!!8F]U="!!;F%R8VAI<W1S"E-E;F0@;F5W<R!R97!O<G1S('1O($$M:6YF
M;W,M96X@;6%I;&EN9R!L:7-T"D$M:6YF;W,M96Y`86EN9F]S+F-A"E-U8G-C
M<FEB92]5;G-U8G-C<FEB92!H='1P.B\O86EN9F]S+F-A+V-G:2UB:6XO;6%I
M;&UA;B]L:7-T:6YF;R]A+6EN9F]S+65N"D%R8VAI=F4Z(&AT='`Z+R]A:6YF
(;W,N8V$O96X`
`
end



In GNU Emacs 23.0.94.1 (mipsel-unknown-linux-gnu, GTK+ Version 2.12.12)
 of 2009-05-27 on theobromine2
configured using `configure  'CFLAGS=-O0 -g -Wno-pointer-sign' 'mipsel-unknown-linux-gnu' 'build_alias=mipsel-unknown-linux-gnu' 'host_alias=mipsel-unknown-linux-gnu' 'target_alias=mipsel-unknown-linux-gnu''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: RMAIL

Minor modes in effect:
  gpm-mouse-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
n l y SPC r e s p p j DEL DEL o n d SPC w i t h SPC 
" m a y b e " . RET I SPC d o n ' t SPC k n o w SPC 
w h e t h e r SPC t h e s e SPC ESC DEL C-a C-k I SPC 
c a n n o t SPC j u d g e SPC DEL , SPC b a s e d SPC 
o n SPC t h e SPC a m o u n t SPC o f SPC l i c ESC 
DEL ESC DEL ESC DEL ESC DEL w h a t SPC y o u SPC h 
a v e SPC s a i d , SPC w h e t h e r SPC I SPC w o 
u d l SPC c o n s i d e r ESC b C-b C-b C-t C-e RET 
t h i s SPC g o o d SPC o r SPC b a . DEL d . SPC SPC 
I SPC c a n ESC / ESC SPC ESC / SPC w h ESC / ESC SPC 
ESC / ESC SPC ESC DEL t h e y SPC w o u l d SPC b e 
SPC ESC b ESC b ESC b ESC d i t C-e a SPC f r e e SPC 
l i c e n s e . RET C-c C-c d x C-l C-x h ESC x w r 
SPC r e RET f o o . m s g RET C-x C-f ESC p RET C-l 
ESC x C-g C-x k RET ESC x r e p o r t SPC e m a c TAB 
RET

Recent messages:
Auto-saving...done
Mark set [2 times]
Auto-saving...done
Sending...
Wrote /home/rms/outgoing/out-56
Sending...done
No following nondeleted message
Expunging deleted messages...done
Mark set [2 times]
Wrote /home/rms/foo.msg
Quit





^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2009-06-10  0:35 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-06-06  2:48 bug#3452: 23.0.94; display Chong Yidong
  -- strict thread matches above, loose matches on Subject: below --
2009-06-07  3:47 Chong Yidong
2009-06-07  9:16 ` Eli Zaretskii
2009-06-07 13:56   ` Chong Yidong
2009-06-07 14:30     ` Eli Zaretskii
2009-06-07 20:41   ` Chong Yidong
2009-06-07 22:53     ` Eli Zaretskii
2009-06-08  1:51 ` Kenichi Handa
2009-06-08  4:48   ` Eli Zaretskii
2009-06-08  8:10     ` Kenichi Handa
2009-06-08  8:44       ` Eli Zaretskii
2009-06-08 11:57         ` Kenichi Handa
2009-06-08 14:47           ` Chong Yidong
2009-06-09 18:00           ` Chong Yidong
2009-06-10  0:35             ` Kenichi Handa
2009-06-03  2:53 Richard Stallman

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