bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[David Edmondson]

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This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

If a line-prefix property is added to a region of a buffer, the
displayed line-prefix region inherits the face properties from the
preceding line rather than from the first character on the line, except
if the region so propertised starts at the beginning of the
buffer.

This can be demonstrated with the following code:

(defvar tp-text-1 "Clicking on the button for the part saves the wrong thing, though, because it's not a real MIME part. That looks a bit awkward to fix, so perhaps you could still prefix the name with \"inline: \" to indicate that it's odd?\n")

(defvar tp-text-2 "Similar to `notmuch-search-line-faces', `notmuch-show-line-faces' allows the header line in `notmuch-show-mode' buffers to be coloured according to the tags of the message.\n")

(defun tp-set-prefix (s e prefix)
  (put-text-property s e 'line-prefix prefix)
  (put-text-property s e 'wrap-prefix prefix))

(defun tp ()
  (interactive)

  (switch-to-buffer (get-buffer-create "*tp test*"))
  (erase-buffer)

  (visual-line-mode t)

  (let* ((i 5)
	 (leader (make-string i ? ))
	  s e)

    (setq s (point))
    (insert tp-text-1)
    (setq e (point))

    (tp-set-prefix s e leader)
    (put-text-property s e 'face '(:background "darkorange"))

    (setq s (point))
    (insert tp-text-2)
    (setq e (point))

    (tp-set-prefix s e (concat leader "> "))
    (put-text-property s e 'face '(:background "darkblue"))

  ))

After evaluating the function `tp', I would expect the line-prefix text
before "Similar to `notmuch-search-line-faces'.." to have a dark blue
background. Instead it is dark orange.

Note that the first line-prefix (at the start of the buffer) has the
correct dark orange background.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.0.92/etc/DEBUG.


In GNU Emacs 24.0.92.1 (x86_64-pc-linux-gnu, X toolkit)
 of 2011-12-13 on zelenka, modified by Debian
 (emacs-snapshot package, version 1:20111219-1)
Windowing system distributor `The X.Org Foundation', version 11.0.11101902
configured using `configure  '--build' 'x86_64-linux-gnu' '--host' 'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.0.92/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.0.92/site-lisp:/usr/share/emacs/site-lisp' '--without-compress-info' '--with-crt-dir=/usr/lib/x86_64-linux-gnu/' '--with-x=yes' '--with-x-toolkit=lucid' 'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: ERC

Minor modes in effect:
  shell-dirtrack-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-spelling-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-netsplit-mode: t
  erc-match-mode: t
  erc-list-mode: t
  erc-pcomplete-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-autojoin-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-keep-place-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  flyspell-mode: t
  display-battery-mode: t
  savehist-mode: t
  display-time-mode: t
  iswitchb-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
n c e SPC a t SPC t h e SPC c o d e , SPC w o u l d 
SPC y o u SPC a g r e e SPC t h a t SPC i t SPC s e 
e m s SPC i n c o r r e C-w C-w i s SPC i n c o r r 
e c t l y SPC c o l o u r e d ? <return> C-c i q C-x 
I C-g C-x I C-g C-c I <return> a SPC a a a r C-n C-n 
C-p C-k C-k C-k C-k C-n C-n C-n C-n C-n C-n C-n C-n 
C-SPC M-> M-k <return> W e l l , SPC t o SPC b e SPC 
h o n e s t , SPC I S-SPC d o n ' t SPC p l a n SPC 
t o SPC u s e SPC i t . SPC M a y b e SPC j 4 n i SPC 
c o u l d SPC p r o b v i <backspace> <backspace> <backspace> 
v u i d e SPC <backspace> <backspace> <backspace> <backspace> 
<backspace> i d e SPC a n SPC e x a m p l e ? M-> <return> 
C-c C-c V q a a a = q C-c p <return> SPC SPC a q I 
' l l SPC f i l e SPC t h e SPC b u g SPC a n d SPC 
s e e SPC w h a t SPC h a p p e n s . <return> M-x 
b u <tab> g <tab> C-w f i l e - <tab> e m <tab> C-w 
C-w r e p o <tab> r <tab> b <tab> <return>

Recent messages:
Quit [2 times]
Mark set
Auto-saving...done
Mark set
Sending...
Sending via mail...
Sending...done
View mode: type C-h for help, h for commands, q to quit.
End of search results. [2 times]
Making completion list... [4 times]

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/home/dme/t/gnus/lisp/mml-sec hides /usr/share/emacs/24.0.92/lisp/gnus/mml-sec
/home/dme/t/gnus/lisp/gnus-gravatar hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-gravatar
/home/dme/t/gnus/lisp/gnus-salt hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-salt
/home/dme/t/gnus/lisp/sieve-mode hides /usr/share/emacs/24.0.92/lisp/gnus/sieve-mode
/home/dme/t/gnus/lisp/nnmh hides /usr/share/emacs/24.0.92/lisp/gnus/nnmh
/home/dme/t/gnus/lisp/gnus-bcklg hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-bcklg
/home/dme/t/gnus/lisp/mail-prsvr hides /usr/share/emacs/24.0.92/lisp/gnus/mail-prsvr
/home/dme/t/gnus/lisp/plstore hides /usr/share/emacs/24.0.92/lisp/gnus/plstore
/home/dme/t/gnus/lisp/nnmaildir hides /usr/share/emacs/24.0.92/lisp/gnus/nnmaildir
/home/dme/t/gnus/lisp/mm-uu hides /usr/share/emacs/24.0.92/lisp/gnus/mm-uu
/home/dme/t/gnus/lisp/nnoo hides /usr/share/emacs/24.0.92/lisp/gnus/nnoo
/home/dme/t/gnus/lisp/gnus-kill hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-kill
/home/dme/t/gnus/lisp/rfc2104 hides /usr/share/emacs/24.0.92/lisp/gnus/rfc2104
/home/dme/t/gnus/lisp/nnfolder hides /usr/share/emacs/24.0.92/lisp/gnus/nnfolder
/home/dme/t/gnus/lisp/nndir hides /usr/share/emacs/24.0.92/lisp/gnus/nndir
/home/dme/t/gnus/lisp/spam-report hides /usr/share/emacs/24.0.92/lisp/gnus/spam-report
/home/dme/t/gnus/lisp/mail-source hides /usr/share/emacs/24.0.92/lisp/gnus/mail-source
/home/dme/t/gnus/lisp/gnus-cus hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-cus
/home/dme/t/gnus/lisp/gnus-delay hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-delay
/home/dme/t/gnus/lisp/shr-color hides /usr/share/emacs/24.0.92/lisp/gnus/shr-color
/home/dme/t/gnus/lisp/nnmail hides /usr/share/emacs/24.0.92/lisp/gnus/nnmail
/home/dme/t/gnus/lisp/ecomplete hides /usr/share/emacs/24.0.92/lisp/gnus/ecomplete
/home/dme/t/gnus/lisp/compface hides /usr/share/emacs/24.0.92/lisp/gnus/compface
/home/dme/t/gnus/lisp/nnvirtual hides /usr/share/emacs/24.0.92/lisp/gnus/nnvirtual
/home/dme/t/gnus/lisp/gnus-art hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-art
/home/dme/t/gnus/lisp/spam hides /usr/share/emacs/24.0.92/lisp/gnus/spam
/home/dme/t/gnus/lisp/nnspool hides /usr/share/emacs/24.0.92/lisp/gnus/nnspool
/home/dme/t/gnus/lisp/mailcap hides /usr/share/emacs/24.0.92/lisp/gnus/mailcap
/home/dme/t/gnus/lisp/ietf-drums hides /usr/share/emacs/24.0.92/lisp/gnus/ietf-drums
/home/dme/t/gnus/lisp/gnus-mlspl hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-mlspl
/home/dme/t/gnus/lisp/gnus-topic hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-topic
/home/dme/t/gnus/lisp/nnmairix hides /usr/share/emacs/24.0.92/lisp/gnus/nnmairix
/home/dme/t/gnus/lisp/utf7 hides /usr/share/emacs/24.0.92/lisp/gnus/utf7
/home/dme/t/gnus/lisp/gmm-utils hides /usr/share/emacs/24.0.92/lisp/gnus/gmm-utils
/home/dme/t/gnus/lisp/mm-util hides /usr/share/emacs/24.0.92/lisp/gnus/mm-util
/home/dme/t/gnus/lisp/gnus-bookmark hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-bookmark
/home/dme/t/gnus/lisp/gnus-group hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-group
/home/dme/t/gnus/lisp/messcompat hides /usr/share/emacs/24.0.92/lisp/gnus/messcompat
/home/dme/t/gnus/lisp/gnus-score hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-score
/home/dme/t/gnus/lisp/.dir-locals hides /usr/share/emacs/24.0.92/lisp/gnus/.dir-locals
/home/dme/t/gnus/lisp/nnagent hides /usr/share/emacs/24.0.92/lisp/gnus/nnagent
/home/dme/t/gnus/lisp/mml2015 hides /usr/share/emacs/24.0.92/lisp/gnus/mml2015
/home/dme/t/gnus/lisp/flow-fill hides /usr/share/emacs/24.0.92/lisp/gnus/flow-fill
/home/dme/t/gnus/lisp/gnus-draft hides /usr/share/emacs/24.0.92/lisp/gnus/gnus-draft
/home/dme/t/gnus/lisp/mml1991 hides /usr/share/emacs/24.0.92/lisp/gnus/mml1991
/home/dme/t/gnus/lisp/nnrss hides /usr/share/emacs/24.0.92/lisp/gnus/nnrss
/home/dme/t/gnus/lisp/mm-view hides /usr/share/emacs/24.0.92/lisp/gnus/mm-view
/usr/share/emacs/24.0.92/site-lisp/emms/tq hides /usr/share/emacs/24.0.92/lisp/emacs-lisp/tq
/home/dme/t/gnus/lisp/time-date hides /usr/share/emacs/24.0.92/lisp/calendar/time-date
/home/dme/t/gnus/lisp/parse-time hides /usr/share/emacs/24.0.92/lisp/calendar/parse-time
/home/dme/t/gnus/lisp/pgg-def hides /usr/share/emacs/24.0.92/lisp/obsolete/pgg-def
/home/dme/t/gnus/lisp/pgg-pgp5 hides /usr/share/emacs/24.0.92/lisp/obsolete/pgg-pgp5
/home/dme/t/gnus/lisp/pgg-parse hides /usr/share/emacs/24.0.92/lisp/obsolete/pgg-parse
/home/dme/t/gnus/lisp/pgg hides /usr/share/emacs/24.0.92/lisp/obsolete/pgg
/home/dme/t/gnus/lisp/pgg-gpg hides /usr/share/emacs/24.0.92/lisp/obsolete/pgg-gpg
/home/dme/t/gnus/lisp/pgg-pgp hides /usr/share/emacs/24.0.92/lisp/obsolete/pgg-pgp

Features:
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lpr nxml-uchnm rng-xsd xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc
rng-uri rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns
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url-auth url-gw url-cache url url-proxy url-privacy url-expand
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gnus-sum nnoo gnus-group gnus-undo nnmail mail-source gnus-start
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shell grep compile view magit log-edit pcvs-util add-log magit-key-mode
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ietf-drums mm-util mail-prsvr regexp-opt winner ring windmove w3m-load
slime-autoloads emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode bbdb-autoloads tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
abbrev minibuffer loaddefs button faces cus-face files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting x-toolkit x
multi-tty emacs)

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bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Eli Zaretskii]

> From: David Edmondson <dme@dme.org>
> Date: Wed, 28 Dec 2011 12:47:18 +0000
> 
> If a line-prefix property is added to a region of a buffer, the
> displayed line-prefix region inherits the face properties from the
> preceding line rather than from the first character on the line, except
> if the region so propertised starts at the beginning of the
> buffer.

I can confirm this.  However, Emacs 23 behaves the same, so this is
not a regression.  I suspect Emacs behaved like this ever since the
line-prefix feature was added.

Nevertheless, I will look into fixing this in a day or two, unless
someone beats me to it.

Thanks for reporting this.

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Eli Zaretskii]

> From: David Edmondson <dme@dme.org>
> Date: Wed, 28 Dec 2011 12:47:18 +0000
> 
> If a line-prefix property is added to a region of a buffer, the
> displayed line-prefix region inherits the face properties from the
> preceding line rather than from the first character on the line, except
> if the region so propertised starts at the beginning of the
> buffer.

As I suspected, this happens simply because we don't change the face
used for display until we process the first character that has a
different face, in this case the first character on the line.

It is possible to change that, but we need to decide first whether the
current behavior is wrong or not.

IOW, why would the user expect that the line-prefix be rendered using
the face that begins _after_ the prefix?  This would be unlike
anything else in the Emacs display operation.  Is this case really
different?  What if the different face starts on some character that
is not the line's first character -- would you, David, expect the
line-prefix use that different face? if not, why do so when the
different face begins at the line's beginning?

Conceptually, a line-prefix and wrap-prefix are just display strings,
only specified differently.  They therefore behave just like display
strings, in that they inherit the face of the _preceding_ text.  If
you don't want that, you will have to specify face properties for the
line-prefix.  (This is, btw, the workaround for the problem you had.)

So my vote is to leave this as it works now, and maybe document this
to avoid surprises.

If the decision is nevertheless to change the behavior as David
expected, then we need to consider additional issues/complications:

 . what, if anything, should we do with wrap-prefix? should it also
   "inherit" the face of the first character of the continuation line?

 . would the result look as TRT when bidirectional text is involved?
   If the line with a prefix begins with right-to-left text, the first
   character of the line will not be the first (leftmost) character on
   display, while the leftmost character on display might then have a
   face that is different from that of line-prefix, which will look
   odd to say the least.

 . should this "inheritance" be limited to faces, or should other text
   properties behave like that as well? e.g., what about `mouse-face'
   or `pointer' properties?

Comments are welcome.

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[David Edmondson]

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On Sat, 31 Dec 2011 16:09:41 +0200, Eli Zaretskii <eliz@gnu.org> wrote:
> IOW, why would the user expect that the line-prefix be rendered using
> the face that begins _after_ the prefix?  This would be unlike
> anything else in the Emacs display operation.  Is this case really
> different?  What if the different face starts on some character that
> is not the line's first character -- would you, David, expect the
> line-prefix use that different face? if not, why do so when the
> different face begins at the line's beginning?

Your explanation makes sense and setting properties on the string used
for the line-prefix/wrap-prefix does indeed produce the desired result
(thanks!).

Perhaps I should update the bug to read 'why is the line-prefix at point
== 1 shown with the properties of the following character', though. Is
there special code for handling that case?

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bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Eli Zaretskii]

> From: David Edmondson <dme@dme.org>
> Date: Tue, 03 Jan 2012 10:15:36 +0000
> 
> Perhaps I should update the bug to read 'why is the line-prefix at point
> == 1 shown with the properties of the following character', though. Is
> there special code for handling that case?

It's an implementation detail.  For the prefix at the beginning of the
buffer, the display iterator is loaded in advance with the face of the
first character of the buffer.  For other lines, it is loaded with the
face of the last character processed in the previous line.

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Chong Yidong]

Eli Zaretskii <eliz@gnu.org> writes:

> So my vote is to leave this as it works now, and maybe document this
> to avoid surprises.

Agreed about leaving this alone for now, though I'd rather not commit to
documenting it as "the" behavior just yet.

OTOH, the "expected" behavior would be for the line-prefix not to
inherit face properties at all, much like overlay before-strings.

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Eli Zaretskii]

> From: Chong Yidong <cyd@gnu.org>
> Cc: David Edmondson <dme@dme.org>,  Stefan Monnier <monnier@iro.umontreal.ca>,  Miles Bader <miles@gnu.org>,  10395@debbugs.gnu.org
> Date: Sat, 07 Jan 2012 15:30:25 +0800
> 
> OTOH, the "expected" behavior would be for the line-prefix not to
> inherit face properties at all, much like overlay before-strings.

Fair enough.  If we can agree on what is the desired behavior, then
Someone™, some day could implement it.

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Chong Yidong]

Chong Yidong <cyd@gnu.org> writes:

>> So my vote is to leave this as it works now, and maybe document this
>> to avoid surprises.
>
> Agreed about leaving this alone for now, though I'd rather not commit to
> documenting it as "the" behavior just yet.
>
> OTOH, the "expected" behavior would be for the line-prefix not to
> inherit face properties at all, much like overlay before-strings.

Whoops.  Looks like there's a realistic situation in which this pops up,
and looks bad: Bug#4281.  I committed a fix for that (revno 107654),
before remembering about the discussion in this thread and the decision
to leave it alone.

I guess I could revert the fix.  But first, is there a work-around for
Bug#4281?  The line prefix applied by org-indent-set-line-properties
does have an explicit `face' property, but that didn't seem to stop the
global-hl-line-mode highlighting from leaking into the prefix.

bug#10395: 24.0.92; line-prefix text inherits face properties from the preceding line rather than following text

[Eli Zaretskii]

> From: Chong Yidong <cyd@gnu.org>
> Cc: 10395@debbugs.gnu.org,  Miles Bader <miles@gnu.org>,  Stefan Monnier <monnier@iro.umontreal.ca>,  David Edmondson <dme@dme.org>
> Date: Thu, 22 Mar 2012 15:32:53 +0800
> 
> Whoops.  Looks like there's a realistic situation in which this pops up,
> and looks bad: Bug#4281.  I committed a fix for that (revno 107654),
> before remembering about the discussion in this thread and the decision
> to leave it alone.
> 
> I guess I could revert the fix.  But first, is there a work-around for
> Bug#4281?  The line prefix applied by org-indent-set-line-properties
> does have an explicit `face' property, but that didn't seem to stop the
> global-hl-line-mode highlighting from leaking into the prefix.

Since you installed this, I suggest to leave it and see if any
problems pop up.