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1. Start Emacs:
    $ emacs -Q
2. Type "=E2=97=8C=E0=B8=B6" (U+25CC followed by U+E36)

Expected behavior: the vowel marker appears over the dotted circle, per
the usual convention for presenting Thai vowels without preceding
consonants.

Actual behavior: the characters do not combine; a dotted circle is shown
followed by the vowel over empty space.

See also: http://en.wikipedia.org/wiki/Dotted_circle

Emacs-specific on my system.

Apologies if this is a duplicate; I could not find a prior report.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-07 on lamiak, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Brady Garvin <bgarvin@HIDDEN>
Subject: bug#17739: Acknowledgement (24.3; Dotted circle does not combine
 with Thai vowel markers)
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References: <871tuzgvcd.fsf@HIDDEN>
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Subject: bug#17739: 24.3; Dotted circle does not combine with Thai vowel markers
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Date: Sun, 08 Jun 2014 20:41:31 +0200
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Brady Garvin <bgarvin@HIDDEN> writes:

> Actual behavior: the characters do not combine; a dotted circle is shown
> followed by the vowel over empty space.

Emacs can only combine characters if they are displayed by the same
font.

Andreas.

-- 
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"And now for something completely different."




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Thanks.  However, I see the same problem even putting both characters
in the same font.  With S-mouse-1 "Change Buffer Font..." I select
Norasi.  M-x describe-char then reports

         character: ◌ (9676, #o22714, #x25cc)
preferred charset: unicode-bmp
 		   (Unicode Basic Multilingual Plane (U+0000..U+FFFF))
        code point: 0x25CC
            syntax: w 	which means: word
          category: .:Base
       buffer code: #xE2 #x97 #x8C
         file code: #xE2 #x97 #x8C (encoded by coding system utf-8-unix)
           display: by this font (glyph code)
     xft:-unknown-Norasi-normal-normal-normal-*-13-*-*-*-*-0-iso10646-1 (#x146)

and

         character: ึ (3638, #o7066, #xe36)
preferred charset: unicode-bmp
 		   (Unicode Basic Multilingual Plane (U+0000..U+FFFF))
        code point: 0x0E36
            syntax: w 	which means: word
          category: 2:upper diacritic, t:Thai
       buffer code: #xE0 #xB8 #xB6
         file code: #xE0 #xB8 #xB6 (encoded by coding system utf-8-unix)
           display: by this font (glyph code)
     xft:-unknown-Norasi-normal-normal-normal-*-13-*-*-*-*-0-iso10646-1 (#x109)

The characters remain uncombined.
--1568735909-1628236746-1402263475=:51322--




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> Date: Sun, 8 Jun 2014 16:37:55 -0500 (CDT)
> From: Brady Garvin <bgarvin@HIDDEN>
> 
> Thanks.  However, I see the same problem even putting both characters
> in the same font.  With S-mouse-1 "Change Buffer Font..." I select
> Norasi.  M-x describe-char then reports
> 
>          character: ◌ (9676, #o22714, #x25cc)
> preferred charset: unicode-bmp
>  		   (Unicode Basic Multilingual Plane (U+0000..U+FFFF))
>         code point: 0x25CC
>             syntax: w 	which means: word
>           category: .:Base
>        buffer code: #xE2 #x97 #x8C
>          file code: #xE2 #x97 #x8C (encoded by coding system utf-8-unix)
>            display: by this font (glyph code)
>      xft:-unknown-Norasi-normal-normal-normal-*-13-*-*-*-*-0-iso10646-1 (#x146)
> 
> and
> 
>          character: ึ (3638, #o7066, #xe36)
> preferred charset: unicode-bmp
>  		   (Unicode Basic Multilingual Plane (U+0000..U+FFFF))
>         code point: 0x0E36
>             syntax: w 	which means: word
>           category: 2:upper diacritic, t:Thai
>        buffer code: #xE0 #xB8 #xB6
>          file code: #xE0 #xB8 #xB6 (encoded by coding system utf-8-unix)
>            display: by this font (glyph code)
>      xft:-unknown-Norasi-normal-normal-normal-*-13-*-*-*-*-0-iso10646-1 (#x109)
> 
> The characters remain uncombined.

Check out the character composition rules in thai-util.el, perhaps
something is missing there.




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>
> Check out the character composition rules in thai-util.el, perhaps
> something is missing there.
>

Thanks for the pointer.  With

58c58,59
< (let ((l '((?ก consonant "LETTER KO KAI")				; 0xA1
---
> (let ((l '((?◌ consonant "DOTTED CIRCLE")
> 	   (?ก consonant "LETTER KO KAI")				; 0xA1

and a reevaluation of the relevant s-expression, thai-compose-region
and thai-compose-buffer give me almost correct results for that test
case.  The vowel does combine, but renders oddly:

When the cursor is over the dotted circle, the vowel, which should
appear roughly centered above, is shown above and to the left.

When the cursor is just to the right of the dotted circle, the vowel
is shown in the same place, but the character to the left of the
dotted circle is occluded by another dotted circle.

When the cursor is just to the left of the dotted circle, the vowel is
shown above and to the right.

When the cursor is elsewhere, the rendering is unchanged from its most
recent state.

Perhaps that's a separate issue?
--1568735909-972883013-1402283869=:64819--




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> Date: Sun, 8 Jun 2014 22:17:49 -0500 (CDT)
> From: Brady Garvin <bgarvin@HIDDEN>
> 
> Thanks for the pointer.  With
> 
> 58c58,59
> < (let ((l '((?ก consonant "LETTER KO KAI")				; 0xA1
> ---
> > (let ((l '((?◌ consonant "DOTTED CIRCLE")
> > 	   (?ก consonant "LETTER KO KAI")				; 0xA1
> 
> and a reevaluation of the relevant s-expression, thai-compose-region
> and thai-compose-buffer give me almost correct results for that test
> case.  The vowel does combine, but renders oddly:
> 
> When the cursor is over the dotted circle, the vowel, which should
> appear roughly centered above, is shown above and to the left.
> 
> When the cursor is just to the right of the dotted circle, the vowel
> is shown in the same place, but the character to the left of the
> dotted circle is occluded by another dotted circle.
> 
> When the cursor is just to the left of the dotted circle, the vowel is
> shown above and to the right.
> 
> When the cursor is elsewhere, the rendering is unchanged from its most
> recent state.
> 
> Perhaps that's a separate issue?

The first suspect is your font driver.  As described in INSTALL, you
need to build Emacs with libotf, m17n-db, and libm17n-flt libraries to
correctly display complex scripts.  Did you build Emacs with those?




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>
> The first suspect is your font driver.  As described in INSTALL, you
> need to build Emacs with libotf, m17n-db, and libm17n-flt libraries to
> correctly display complex scripts.  Did you build Emacs with those?
>

Not sure; I'm using the Ubuntu package emacs24.  I'll try a fresh
build after work and, if that fixes it, send a report to Canonical.




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In article <838up63j1x.fsf@HIDDEN>, Eli Zaretskii <eliz@HIDDEN> writes:

> Check out the character composition rules in thai-util.el, perhaps
> something is missing there.

The function for composing Thai is thai-composition-function
in thai-util.el and which surely doesn't handle
dotted-circle.  I think what we need is a general function
to compose dotted-circle with the following character
artifically.  When you eval the following code:

(defun compose-dotted-circle (gstring)
  (let* ((dotted-circle-glyph (lgstring-glyph gstring 0))
	 (following-glyph (lgstring-glyph gstring 1))
	 (from (lglyph-from dotted-circle-glyph))
	 (to (lglyph-to following-glyph)))
    (lglyph-set-from-to dotted-circle-glyph from to)
    (lglyph-set-from-to following-glyph from to)
    gstring))

(aset composition-function-table ?=E2=97=8C '(["=E2=97=8C[^=E2=97=8C ]" 0 c=
ompose-dotted-circle]))

and Thai characters and dotted circle use the same Norasi
font, I think you get a good result.  Could you please try?

But, the above function is not yet perfect.  In some fonts,
a glyhp of dotted-circle may have positive width, a glyph of
a character following dotted-circle may be narrower than the
glyph of dotted-circle.  The function should handle those
cases gracefully.  I'm now working on it.

---
Kenichi Handa
handa@HIDDEN




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In article <877g4n5sww.fsf@HIDDEN>, handa@HIDDEN (K. Handa) writes:

> But, the above function is not yet perfect.  In some fonts,
> a glyhp of dotted-circle may have positive width, a glyph of
> a character following dotted-circle may be narrower than the
> glyph of dotted-circle.  The function should handle those
> cases gracefully.  I'm now working on it.

I've just committed a function to handle dotted-circle
properly to the trunk.

---
Kenichi Handa
handa@HIDDEN




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1. Start Emacs:
    $ emacs -Q
2. Type "=E2=97=8C=E0=B8=B6" (U+25CC followed by U+E36)

Expected behavior: the vowel marker appears over the dotted circle, per
the usual convention for presenting Thai vowels without preceding
consonants.

Actual behavior: the characters do not combine; a dotted circle is shown
followed by the vowel over empty space.

See also: http://en.wikipedia.org/wiki/Dotted_circle

Emacs-specific on my system.

Apologies if this is a duplicate; I could not find a prior report.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-07 on lamiak, modified by Debian
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Subject: Re: bug#17739: 24.3;
 Dotted circle does not combine with Thai vowel markers
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handa@HIDDEN (K. Handa) writes:

> In article <877g4n5sww.fsf@HIDDEN>, handa@HIDDEN (K. Handa) writes:
>
>> But, the above function is not yet perfect.  In some fonts,
>> a glyhp of dotted-circle may have positive width, a glyph of
>> a character following dotted-circle may be narrower than the
>> glyph of dotted-circle.  The function should handle those
>> cases gracefully.  I'm now working on it.
>
> I've just committed a function to handle dotted-circle
> properly to the trunk.

Since there have been no further updates in 5 years, I'm going to
assume that the fix worked as expected and close this bug.  If that is
incorrect, please report back and we can reopen the bug report.

Best regards,
Stefan Kangas


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Subject: bug#17739: closed (Re: bug#17739: 24.3; Dotted circle does not
 combine with Thai vowel markers)
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Your bug report

#17739: 24.3; Dotted circle does not combine with Thai vowel markers

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17739 <at> debbugs.gnu.org.

--=20
17739: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D17739
GNU Bug Tracking System
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From: Stefan Kangas <stefan@HIDDEN>
Date: Sat, 21 Sep 2019 01:04:37 +0200
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Subject: Re: bug#17739: 24.3;
 Dotted circle does not combine with Thai vowel markers
To: handa@HIDDEN
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handa@HIDDEN (K. Handa) writes:

> In article <877g4n5sww.fsf@HIDDEN>, handa@HIDDEN (K. Handa) writes:
>
>> But, the above function is not yet perfect.  In some fonts,
>> a glyhp of dotted-circle may have positive width, a glyph of
>> a character following dotted-circle may be narrower than the
>> glyph of dotted-circle.  The function should handle those
>> cases gracefully.  I'm now working on it.
>
> I've just committed a function to handle dotted-circle
> properly to the trunk.

Since there have been no further updates in 5 years, I'm going to
assume that the fix worked as expected and close this bug.  If that is
incorrect, please report back and we can reopen the bug report.

Best regards,
Stefan Kangas


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Subject: 24.3; Dotted circle does not combine with Thai vowel markers
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1. Start Emacs:
    $ emacs -Q
2. Type "=E2=97=8C=E0=B8=B6" (U+25CC followed by U+E36)

Expected behavior: the vowel marker appears over the dotted circle, per
the usual convention for presenting Thai vowels without preceding
consonants.

Actual behavior: the characters do not combine; a dotted circle is shown
followed by the vowel over empty space.

See also: http://en.wikipedia.org/wiki/Dotted_circle

Emacs-specific on my system.

Apologies if this is a duplicate; I could not find a prior report.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-07 on lamiak, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Sat, 21 Sep 2019 01:04:37 +0200
> Cc: bgarvin@HIDDEN, 17739-done <at> debbugs.gnu.org, 
> 	Eli Zaretskii <eliz@HIDDEN>
> 
> handa@HIDDEN (K. Handa) writes:
> 
> > In article <877g4n5sww.fsf@HIDDEN>, handa@HIDDEN (K. Handa) writes:
> >
> >> But, the above function is not yet perfect.  In some fonts,
> >> a glyhp of dotted-circle may have positive width, a glyph of
> >> a character following dotted-circle may be narrower than the
> >> glyph of dotted-circle.  The function should handle those
> >> cases gracefully.  I'm now working on it.
> >
> > I've just committed a function to handle dotted-circle
> > properly to the trunk.
> 
> Since there have been no further updates in 5 years, I'm going to
> assume that the fix worked as expected and close this bug.  If that is
> incorrect, please report back and we can reopen the bug report.

The original recipe still doesn't display correctly on the current
master, so I think something is still missing.  Not sure what exactly
is missing.




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From: Stefan Kangas <stefan@HIDDEN>
Date: Sat, 21 Sep 2019 11:36:54 +0200
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Eli Zaretskii <eliz@HIDDEN> writes:

> > > I've just committed a function to handle dotted-circle
> > > properly to the trunk.
> >
> > Since there have been no further updates in 5 years, I'm going to
> > assume that the fix worked as expected and close this bug.  If that is
> > incorrect, please report back and we can reopen the bug report.
>
> The original recipe still doesn't display correctly on the current
> master, so I think something is still missing.  Not sure what exactly
> is missing.

OK, you're right.  Reopening.

However, it works properly for me using my init file AFAICT.  I'm
using the following recipe:

1. C-x 8 RET
2. DOTTED CIRCLE RET
3. C-x 8 RET
4. THAI CHARACTER SARA UE RET

1. Using my init file, the characters compose and M-x describe-char gives:

             position: 300 of 3559 (8%), column: 9
            character: =E2=97=8C (displayed as =E2=97=8C) (codepoint 9676, =
#o22714, #x25cc)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0x25CC
               script: symbol
               syntax: w     which means: word
             category: .:Base
             to input: type "C-x 8 RET 25cc" or "C-x 8 RET DOTTED CIRCLE"
          buffer code: #xE2 #x97 #x8C
            file code: #xE2 #x97 #x8C (encoded by coding system utf-8-unix)
              display: composed to form "=E2=97=8C=E0=B8=B6" (see below)

Composed with the following character(s) "=E0=B8=B6" using this font:
  x:-mutt-clearlyu-medium-r-normal--17-120-100-100-p-123-iso10646-1
by these glyphs:
  [0 1 9676 9676 14 2 13 12 -1 nil]
  [0 1 3638 3638 0 -7 0 14 -9 [0 -3 0]]

Character code properties: customize what to show
  name: DOTTED CIRCLE
  general-category: So (Symbol, Other)
  decomposition: (9676) ('=E2=97=8C')

I've attached a screenshot of the above.

2. When I run under emacs -Q, I see two characters next to each other
and M-x describe-char says:

a)

             position: 146 of 147 (99%), column: 0
            character: =E2=97=8C (displayed as =E2=97=8C) (codepoint 9676, =
#o22714, #x25cc)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0x25CC
               script: symbol
               syntax: w     which means: word
             category: .:Base
             to input: type "C-x 8 RET 25cc" or "C-x 8 RET DOTTED CIRCLE"
          buffer code: #xE2 #x97 #x8C
            file code: #xE2 #x97 #x8C (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    xfthb:-PfEd-DejaVu Sans
Mono-normal-normal-normal-*-16-*-*-*-m-0-iso10646-1 (#xA23)

Character code properties: customize what to show
  name: DOTTED CIRCLE
  general-category: So (Symbol, Other)
  decomposition: (9676) ('=E2=97=8C')

b)

             position: 147 of 147 (99%), column: 1
            character: =E0=B8=B6 (displayed as =E0=B8=B6) (codepoint 3638, =
#o7066, #xe36)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0x0E36
               script: thai
               syntax: w     which means: word
             category: 2:upper diacritic, ^:Combining, t:Thai
             to input: type "C-x 8 RET e36" or "C-x 8 RET THAI
CHARACTER SARA UE"
          buffer code: #xE0 #xB8 #xB6
            file code: #xE0 #xB8 #xB6 (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    xfthb:-GOOG-Noto Sans Thai
UI-normal-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x77)

Character code properties: customize what to show
  name: THAI CHARACTER SARA UE
  old-name: THAI VOWEL SIGN SARA UE
  general-category: Mn (Mark, Nonspacing)
  decomposition: (3638) ('=E0=B8=B6')

I don't know much of anything about this, but wouldn't that suggest
that the bug is related to the font?

Best regards,
Stefan Kangas

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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Sat, 21 Sep 2019 11:36:54 +0200
> Cc: handa@HIDDEN, bgarvin@HIDDEN, 17739 <at> debbugs.gnu.org
> 
> I don't know much of anything about this, but wouldn't that suggest
> that the bug is related to the font?

It is in your case.  But in my case, even if I start Emacs with
"emacs -Q -fn FONT", where FONT is a font that can display both the
dotted circle and the Thai character, I still see them not combining,
for some reason.




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Stefan Kangas <stefan@HIDDEN> writes:

> I don't know much of anything about this, but wouldn't that suggest
> that the bug is related to the font?

Also, could this be related to Bug#17261?

Best regards,
Stefan Kangas




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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Sat, 21 Sep 2019 11:53:04 +0200
> Cc: handa@HIDDEN, bgarvin@HIDDEN, 17739 <at> debbugs.gnu.org
> 
> Stefan Kangas <stefan@HIDDEN> writes:
> 
> > I don't know much of anything about this, but wouldn't that suggest
> > that the bug is related to the font?
> 
> Also, could this be related to Bug#17261?

No.





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