bug#15298: 24.3.50; Background color lost when highlighting a string

bug#15298: 24.3.50; Background color lost when highlighting a string

[Sebastien Vauban]

Hello,

When highlighting extra regexps through `font-lock-add-keywords', the
background color of Org headlines is lost, as you can see on
http://screencast.com/t/76JLozA6zhP.

Minimal Emacs configuration file:

--8<---------------cut here---------------start------------->8---
(require 'org)

(set-face-attribute 'org-todo nil
                    :weight 'bold :box '(:line-width 1 :color "#D8ABA7")
                    :foreground "#D8ABA7" :background "#FFE6E4")

(set-face-attribute 'org-level-1 nil
                    :weight 'bold :overline "#A7A7A7"
                    :foreground "#3C3C3C" :background "#F0F0F0")

(set-face-attribute 'org-level-2 nil
                    :weight 'bold
                    :foreground "#123555" :background "#E5F4FB")

;; fontify the whole line for headings (with a background color)
(setq org-fontify-whole-heading-line t)

;; highlight error or warning strings
(defvar my-highlight-regexps
  "\\([Ee]rror\\|ERROR\\|[Ww]arning\\|WARNING\\)"
  "Patterns to highlight.")

(defface my-highlight-face
  '((t (:weight normal :slant normal :box '(:line-width 1 :color "#CC0000")
                :foreground "#CC0000" :background "#FFFF88")))
  "Face for making errors and warnings stand out.")

;; set up highlighting of special patterns for proper selected major modes
(dolist (mode '(org-mode))
  (font-lock-add-keywords
   mode
   `((,my-highlight-regexps 1 'my-highlight-face prepend))))
--8<---------------cut here---------------end--------------->8---

Test file:

--8<---------------cut here---------------start------------->8---
* Section

** TODO Fix this problem

Lorem warning lipsum... The string is highlighted as expected...

** TODO Report the error to dev team

The fact that the level-2 headline looses its background is *not expected*.

** TODO Write an email
--8<---------------cut here---------------end--------------->8---

Best regards,
Seb

In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2013-09-06 on LEG570
Bzr revision: 114155 dmantipov-o+MxOtu4lMCrG7Voo0xbD/xQKTfGK7LlatJR9rMyD4wAYPQei5GzMwIxwlB7+PcL@public.gmane.org
Windowing system distributor `Microsoft Corp.', version 6.2.9200
Configured using:
 `configure --enable-checking 'CFLAGS=-O0 -g3' 'CPPFLAGS=-DGLYPH_DEBUG=1
 -I/c/usr/include''

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  diff-auto-refine-mode: t
  helm-match-plugin-mode: t
  helm-occur-match-plugin-mode: t
  shell-dirtrack-mode: t
  global-auto-complete-mode: t
  recentf-mode: t
  gnus-topic-mode: t
  auto-image-file-mode: t
  gnus-undo-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  tooltip-mode: t
  mouse-wheel-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
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

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register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
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make-network-process w32notify w32 multi-tty emacs)

bug#15298: 24.3.50; Background color lost when highlighting a string

[Glenn Morris]

Minimal example:

(defface foo '((t :foreground "blue" :background "yellow"))
  "foo face")

(define-derived-mode foo-mode nil "foo"
  "foo doc"
  (set (make-local-variable 'font-lock-defaults)
       '((("^FOO.*" . 'foo)))))

(font-lock-add-keywords 'foo-mode '(("bar" 0 'underline prepend)))

Eval that, M-x foo-mode, enter

FOO text bar text

As soon as "bar" is entered, "FOO..." loses its highlighting.


It works if you use instead:

(font-lock-add-keywords 'foo-mode '(("bar" 0 'underline prepend)) 'end)


Another approach that works is:

(define-derived-mode foo-mode nil "foo"
  "foo doc"
  (set (make-local-variable 'font-lock-defaults)
       '((("^FOO.*" 0 'foo append)))))    ; note addition of "append" here

(font-lock-add-keywords 'foo-mode '(("bar" 0 'underline)))


So I think this is not a bug, just a confusing aspect of the way
font-lock-keywords is applied in order.

bug#15298: 24.3.50; Background color lost when highlighting a string

[Sebastien Vauban]

Glenn Morris wrote:
> (font-lock-add-keywords 'foo-mode '(("bar" 0 'underline prepend)))
>
> Eval that, M-x foo-mode, enter
>
> FOO text bar text
>
> As soon as "bar" is entered, "FOO..." loses its highlighting.
>
> It works if you use instead:
>
> (font-lock-add-keywords 'foo-mode '(("bar" 0 'underline prepend)) 'end)
>
> Another approach that works is:
>
> (define-derived-mode foo-mode nil "foo"
>   "foo doc"
>   (set (make-local-variable 'font-lock-defaults)
>        '((("^FOO.*" 0 'foo append)))))    ; note addition of "append" here
>
> (font-lock-add-keywords 'foo-mode '(("bar" 0 'underline)))
>
> So I think this is not a bug, just a confusing aspect of the way
> font-lock-keywords is applied in order.

Side question: when we observe such a word which is not highlighted as
we expect it, is there a way to see the list of all applied faces in the
order they are applied?  That'd help debugging such a problem...

Best regards,
  Seb

-- 
Sebastien Vauban

bug#15298: 24.3.50; Background color lost when highlighting a string

[Eli Zaretskii]

> From: "Sebastien Vauban" <sva-news@mygooglest.com>
> Date: Fri, 13 Dec 2013 13:50:26 +0100
> Cc: 15298@debbugs.gnu.org
> 
> Side question: when we observe such a word which is not highlighted as
> we expect it, is there a way to see the list of all applied faces in the
> order they are applied?  That'd help debugging such a problem...

The problem in this case (and other similar ones) is that the face you
expected was removed, and then another one applied to the same text.
Removed faces are not recorded anywhere, as you might expect.

bug#15298: 24.3.50; Background color lost when highlighting a string

[Sebastien Vauban]

Eli Zaretskii wrote:
>> From: "Sebastien Vauban" <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org>
>> Date: Fri, 13 Dec 2013 13:50:26 +0100
>> Cc: 15298-ubl+/3LiMTaZdePnXv/OxA@public.gmane.org
>> 
>> Side question: when we observe such a word which is not highlighted as
>> we expect it, is there a way to see the list of all applied faces in the
>> order they are applied?  That'd help debugging such a problem...
>
> The problem in this case (and other similar ones) is that the face you
> expected was removed, and then another one applied to the same text.
> Removed faces are not recorded anywhere, as you might expect.

I thought that faces were just added one onto the other, but that the
problem could happen because the order is not the one we expected.

Were are faces removed?

If I'm asking the above, it's because I'd like to see how we can try to
resolve a bug (this time) in Org fontification.

See http://lists.gnu.org/archive/html/emacs-orgmode/2013-03/msg01168.html.

The problem lies in the function `org-set-font-lock-defaults', but I
have to admit it seems too complex for me to fix it. I'm lost in
expressions such as:

--8<---------------cut here---------------start------------->8---
	   ;; DONE
	   (if org-fontify-done-headline
	       (list (format org-heading-keyword-regexp-format
			     (concat
			      "\\(?:"
			      (mapconcat 'regexp-quote org-done-keywords "\\|")
			      "\\)"))
		     '(2 'org-headline-done t))
	     nil)
--8<---------------cut here---------------end--------------->8---

(lines 6278 à 6286 of `org.el')

Best regards,
  Seb

-- 
Sebastien Vauban

bug#15298: 24.3.50; Background color lost when highlighting a string

[Eli Zaretskii]

> From: "Sebastien Vauban" <sva-news@mygooglest.com>
> Cc: 15298@debbugs.gnu.org
> Date: Fri, 13 Dec 2013 16:41:53 +0100
> 
> > The problem in this case (and other similar ones) is that the face you
> > expected was removed, and then another one applied to the same text.
> > Removed faces are not recorded anywhere, as you might expect.
> 
> I thought that faces were just added one onto the other, but that the
> problem could happen because the order is not the one we expected.

The order doesn't matter.  the only limitation is that you cannot have
more than one text property at the same character with different
values of the same property: the latter one overwrites the former one.

> Were are faces removed?

Font Lock removes them, before it applies its own.

bug#15298: 24.3.50; Background color lost when highlighting a string

[Josh]

On Fri, Dec 13, 2013 at 6:11 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: "Sebastien Vauban" <sva-news@mygooglest.com>
>> Date: Fri, 13 Dec 2013 13:50:26 +0100
>> Cc: 15298@debbugs.gnu.org
>>
>> Side question: when we observe such a word which is not highlighted as
>> we expect it, is there a way to see the list of all applied faces in the
>> order they are applied?  That'd help debugging such a problem...
>
> The problem in this case (and other similar ones) is that the face you
> expected was removed, and then another one applied to the same text.
> Removed faces are not recorded anywhere, as you might expect.

Would (faces-at-position nil :include-all) reveal the absence of the
face Sebastien was expecting to have been in effect?

bug#15298: 24.3.50; Background color lost when highlighting a string

[Stefan Monnier]

> I thought that faces were just added one onto the other, but that the
> problem could happen because the order is not the one we expected.

There's another issue at play, here: by default, a rule is only applied
if the matched text has not already been highlighted by an earlier rule.


        Stefan

bug#15298: 24.3.50; Background color lost when highlighting a string

[Eli Zaretskii]

> From: Josh <josh@foxtail.org>
> Date: Fri, 13 Dec 2013 08:14:38 -0800
> Cc: Sebastien Vauban <sva-news@mygooglest.com>, 15298@debbugs.gnu.org
> 
> On Fri, Dec 13, 2013 at 6:11 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> >> From: "Sebastien Vauban" <sva-news@mygooglest.com>
> >> Date: Fri, 13 Dec 2013 13:50:26 +0100
> >> Cc: 15298@debbugs.gnu.org
> >>
> >> Side question: when we observe such a word which is not highlighted as
> >> we expect it, is there a way to see the list of all applied faces in the
> >> order they are applied?  That'd help debugging such a problem...
> >
> > The problem in this case (and other similar ones) is that the face you
> > expected was removed, and then another one applied to the same text.
> > Removed faces are not recorded anywhere, as you might expect.
> 
> Would (faces-at-position nil :include-all) reveal the absence of the
> face Sebastien was expecting to have been in effect?

I have no idea, as there's no such function in my Emacs.  But
describe-text-properties will do the job.

bug#15298: 24.3.50; Background color lost when highlighting a string

[Sebastien Vauban]

Stefan Monnier wrote:
>> I thought that faces were just added one onto the other, but that the
>> problem could happen because the order is not the one we expected.
>
> There's another issue at play, here: by default, a rule is only applied
> if the matched text has not already been highlighted by an earlier rule.

Do I understand correctly that the presented problem can't be fixed,
then?

To restate it,

1. I have defined some Org faces like this (in my custom theme):

--8<---------------cut here---------------start------------->8---
  `(org-headline-done ((,class (:height 1.0 :weight normal :foreground "#999999"))))
  `(org-link ((,class (:underline t :foreground "#006DAF"))))
  `(org-table ((,class (:foreground "dark green" :background "#EAFFEA"))))
--8<---------------cut here---------------end--------------->8---

2. When I set a task DONE, or when I insert a link inside a table, I
   loose some highlighting properties.

See image http://screencast.com/t/mRdBszsssJ for the example:

--8<---------------cut here---------------start------------->8---
*** TODO This text does surimpose on the green background

*** DONE When a task is done, its background becomes white!

|      | Normal text  | 10 |
| link | http://www/  | 11 |
|      | Other things | 12 |
--8<---------------cut here---------------end--------------->8---

Best regards,
  Seb

-- 
Sebastien Vauban

bug#15298: 24.3.50; Background color lost when highlighting a string

[Josh]

On Fri, Dec 13, 2013 at 10:45 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Josh <josh@foxtail.org>
>> Date: Fri, 13 Dec 2013 08:14:38 -0800
>> Cc: Sebastien Vauban <sva-news@mygooglest.com>, 15298@debbugs.gnu.org
>>
>> On Fri, Dec 13, 2013 at 6:11 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> >> From: "Sebastien Vauban" <sva-news@mygooglest.com>
>> >> Date: Fri, 13 Dec 2013 13:50:26 +0100
>> >> Cc: 15298@debbugs.gnu.org
>> >>
>> >> Side question: when we observe such a word which is not highlighted as
>> >> we expect it, is there a way to see the list of all applied faces in the
>> >> order they are applied?  That'd help debugging such a problem...
>> >
>> > The problem in this case (and other similar ones) is that the face you
>> > expected was removed, and then another one applied to the same text.
>> > Removed faces are not recorded anywhere, as you might expect.
>>
>> Would (faces-at-position nil :include-all) reveal the absence of the
>> face Sebastien was expecting to have been in effect?
>
> I have no idea, as there's no such function in my Emacs.  But
> describe-text-properties will do the job.

Indeed, I've been using this function for long enough that I had
forgotten that it resides in my init file instead of Emacs proper.
It extends face-at-point to accept an optional position argument
and to optionally return all of the faces at point instead of only
the first when multiple faces are present.  Here it is, in case
anyone is interested:

(defun faces-at-position (&optional position include-all)
  "Return the face of the character after POSITION.
If no position is specified, (point) is used.  If the character has
more than one face, return only the first one unless INCLUDE-ALL is
non-nil.  Return nil if it has no specified face."
  (setq position (or position (point)))
  (let* ((faceprop (or (get-char-property position 'read-face-name)
                       (get-char-property position 'face)
                       'default))
         (face (cond ((symbolp faceprop) faceprop)
                     ;; List of faces (don't treat an attribute spec).
                     ;; Just use the first face.
                     ((and (consp faceprop) (not (keywordp (car faceprop)))
                           (not (memq (car faceprop)
                      '(foreground-color background-color))))
                      ;;(message "include-all: %s, faceprop: %s"
include-all faceprop)
                      (if include-all faceprop (car faceprop)))
                     (t nil))))         ; Invalid face value.
    (cond ((facep face) (list face))
          ((listp face) face)
          (t nil))))

bug#15298: 24.3.50; Background color lost when highlighting a string

[Stefan Monnier]

>>> I thought that faces were just added one onto the other, but that the
>>> problem could happen because the order is not the one we expected.
>> There's another issue at play, here: by default, a rule is only applied
>> if the matched text has not already been highlighted by an earlier rule.
> Do I understand correctly that the presented problem can't be fixed,
> then?

No, you don't.  You overlooked the fact that I said "by default".
Also you overlooked the fact that I said this depends on the order of
the various rules.

So you can either play with the order of the rules, or you can choose to
use a non-default behavior (see OVERRIDE in font-lock-keywords's
docstring).


        Stefan