GNU bug report logs - #80043
31.0.50; TTY child frame border color is not customizable

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Package: emacs; Reported by: Daniel Mendler <mail@HIDDEN>; Done: Gerd Möllmann <gerd.moellmann@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Daniel Mendler <mail@HIDDEN>
To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#80043: 31.0.50; TTY child frame border color is not
 customizable
In-Reply-To: <m2h5ti4np4.fsf@HIDDEN>
References: <87tsxk27fr.fsf@HIDDEN> <86tsxkxu7i.fsf@HIDDEN>
 <m2ecoocqb6.fsf@HIDDEN> <m2a4zccoti.fsf@HIDDEN>
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Date: Mon, 22 Dec 2025 15:09:23 +0100
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> Patch attached. Could you please give a try, Daniel?
>>
>> (It looks bigger than it is. I've split produce_box_glyphs because it
>> got too big for my taste.)
>
> I've pushed that with a small simplification. And closing.

Thanks, I will try it soon. The plan is to optionally support borders
for the Corfu popup on TTY.

Daniel




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80043; Package emacs. Full text available.
bug marked as fixed in version 31.1, send any further explanations to 80043 <at> debbugs.gnu.org and Daniel Mendler <mail@HIDDEN> Request was from Gerd Möllmann <gerd.moellmann@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80043: 31.0.50; TTY child frame border color is not
 customizable
In-Reply-To: <m2a4zccoti.fsf@HIDDEN>
References: <87tsxk27fr.fsf@HIDDEN> <86tsxkxu7i.fsf@HIDDEN>
 <m2ecoocqb6.fsf@HIDDEN> <m2a4zccoti.fsf@HIDDEN>
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Patch attached. Could you please give a try, Daniel?
>
> (It looks bigger than it is. I've split produce_box_glyphs because it
> got too big for my taste.)

I've pushed that with a small simplification. And closing.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80043; Package emacs. Full text available.

Message received at 80043 <at> debbugs.gnu.org:


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From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80043: 31.0.50; TTY child frame border color is not
 customizable
In-Reply-To: <m2ecoocqb6.fsf@HIDDEN>
References: <87tsxk27fr.fsf@HIDDEN> <86tsxkxu7i.fsf@HIDDEN>
 <m2ecoocqb6.fsf@HIDDEN>
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>>> Cc: martin rudalics <rudalics@HIDDEN>
>>> Date: Sat, 20 Dec 2025 22:02:16 +0100
>>> From:  Daniel Mendler via "Bug reports for GNU Emacs,
>>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>>>=20
>>> When Unicode characters are used for the child frame border, the border
>>> color does not seem to be customizable. Unicode borders can be requested
>>> via `M-x standard-display-unicode-special-glyphs'.
>>
>> How did you try to customize that?  These characters are actually
>> glyphs that come from a display table, and glyphs in the display table
>> can have faces.  See the node "Glyphs" in the ELisp manual, and
>> especially the function make-glyph described there.
>
> No need to check further, I see it: I didn't realize that
> SET_GLYPH_FROM_GLYPH_CODE overwrites the face_id in the GLYPH, in this
> case with 0 if the display-table entry doesn't have a face.
>
> While at it, I'll also merge faces as other such places do, like window
> dividers. Please hold the line.


Patch attached. Could you please give a try, Daniel?

(It looks bigger than it is. I've split produce_box_glyphs because it
got too big for my taste.)


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=0001-border-2.patch

diff --git a/src/dispnew.c b/src/dispnew.c
index d65a7cbc1f1..e002954b626 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -3622,13 +3622,41 @@ neutralize_wide_char (struct frame *root, struct glyph_row *row, int x)
     }
 }
 
-/* Produce glyphs for box character BOX in ROW.  X is the position in
-   ROW where to start producing glyphs.  N is the number of glyphs to
-   produce.  CHILD is the frame to use for the face of the glyphs.  */
+/* Fill *G with the code and face for box character BOX on frame F
+   Value is true if a standard display table entry for BOX exists.  */
+
+static bool
+box_from_display_table (struct frame *f, enum box box, GLYPH *g)
+{
+  if (DISP_TABLE_P (Vstandard_display_table))
+    {
+      struct Lisp_Char_Table *dp = XCHAR_TABLE (Vstandard_display_table);
+      Lisp_Object gc = dp->extras[box];
+      if (GLYPH_CODE_P (gc))
+	{
+	  SET_GLYPH_FROM_GLYPH_CODE (*g, gc);
+	  int lface_id = GLYPH_FACE (*g);
+	  int face_id;
+	  /* If the display-table entry specifies a face, merge that
+	     with the default face because that is what all other such
+	     places do.  The window being used here when merging faces
+	     in this case basically only stands for its frame.  */
+	  if (lface_id > 0)
+	    face_id = merge_faces (XWINDOW (f->root_window), Qt,
+				   lface_id, DEFAULT_FACE_ID);
+	  else
+	    face_id = lookup_basic_face (NULL, f, BORDER_FACE_ID);
+	  SET_GLYPH_FACE (*g, face_id);
+	  return true;
+	}
+    }
+  return false;
+}
+
+/* Fill *G with the default code and face for box BOX on frame F.  */
 
 static void
-produce_box_glyphs (enum box box, struct glyph_row *row, int x, int n,
-		    struct frame *child)
+box_default (struct frame *f, enum box box, GLYPH *g)
 {
   int dflt;
   switch (box)
@@ -3641,7 +3669,7 @@ produce_box_glyphs (enum box box, struct glyph_row *row, int x, int n,
       break;
     case BOX_DOWN_RIGHT:
     case BOX_DOWN_LEFT:
-    case BOX_UP_RIGHT:
+	case BOX_UP_RIGHT:
     case BOX_UP_LEFT:
       dflt = '+';
       break;
@@ -3654,22 +3682,30 @@ produce_box_glyphs (enum box box, struct glyph_row *row, int x, int n,
       emacs_abort ();
     }
 
-  /* FIXME/tty: some face for the border.  */
-  int face_id = BORDER_FACE_ID;
+  int face_id = lookup_basic_face (NULL, f, BORDER_FACE_ID);
+  SET_GLYPH (*g, dflt, face_id);
+}
+
+/* Return the glyph for displaying BOX on frame F.  */
+
+static GLYPH
+box_glyph (struct frame *f, enum box box)
+{
   GLYPH g;
-  SET_GLYPH (g, dflt, face_id);
+  if (!box_from_display_table (f, box, &g))
+    box_default (f, box, &g);
+  return g;
+}
 
-  if (DISP_TABLE_P (Vstandard_display_table))
-    {
-      struct Lisp_Char_Table *dp = XCHAR_TABLE (Vstandard_display_table);
-      Lisp_Object gc = dp->extras[box];
-      if (GLYPH_CODE_P (gc))
-	{
-	  SET_GLYPH_FROM_GLYPH_CODE (g, gc);
-	  /* Sorry, but I really don't care if the glyph has a face :-).  */
-	}
-    }
+/* Produce glyphs for box character BOX in ROW.  X is the position in
+   ROW where to start producing glyphs.  N is the number of glyphs to
+   produce.  CHILD is the frame to use for the face of the glyphs.  */
 
+static void
+produce_box_glyphs (enum box box, struct glyph_row *row, int x, int n,
+		    struct frame *child)
+{
+  GLYPH g = box_glyph (child, box);;
   struct glyph *glyph = row->glyphs[0] + x;
   for (int i = 0; i < n; ++i, ++glyph)
     {

--=-=-=--




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From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80043: 31.0.50; TTY child frame border color is not
 customizable
In-Reply-To: <86tsxkxu7i.fsf@HIDDEN>
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Date: Sun, 21 Dec 2025 07:16:45 +0100
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Cc: martin rudalics <rudalics@HIDDEN>
>> Date: Sat, 20 Dec 2025 22:02:16 +0100
>> From:  Daniel Mendler via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>> 
>> When Unicode characters are used for the child frame border, the border
>> color does not seem to be customizable. Unicode borders can be requested
>> via `M-x standard-display-unicode-special-glyphs'.
>
> How did you try to customize that?  These characters are actually
> glyphs that come from a display table, and glyphs in the display table
> can have faces.  See the node "Glyphs" in the ELisp manual, and
> especially the function make-glyph described there.

No need to check further, I see it: I didn't realize that
SET_GLYPH_FROM_GLYPH_CODE overwrites the face_id in the GLYPH, in this
case with 0 if the display-table entry doesn't have a face.

While at it, I'll also merge faces as other such places do, like window
dividers. Please hold the line.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80043; Package emacs. Full text available.

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> Cc: martin rudalics <rudalics@HIDDEN>
> Date: Sat, 20 Dec 2025 22:02:16 +0100
> From:  Daniel Mendler via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> When Unicode characters are used for the child frame border, the border
> color does not seem to be customizable. Unicode borders can be requested
> via `M-x standard-display-unicode-special-glyphs'.

How did you try to customize that?  These characters are actually
glyphs that come from a display table, and glyphs in the display table
can have faces.  See the node "Glyphs" in the ELisp manual, and
especially the function make-glyph described there.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80043; Package emacs. Full text available.

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From: Daniel Mendler <mail@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; TTY child frame border color is not customizable
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When Unicode characters are used for the child frame border, the border
color does not seem to be customizable. Unicode borders can be requested
via `M-x standard-display-unicode-special-glyphs'.

In contrast, the border uses the color of the `border' face if the
default ASCII border characters are used.

In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-12-20
Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
System Description: Debian GNU/Linux 13 (trixie)

Configured using:
 'configure --prefix=$HOME/.local/share/emacs
 --without-compress-install --with-tree-sitter --with-native-compilation
 --with-dbus --without-selinux --without-threads --disable-gc-mark-trace
 --without-gsettings --without-gpm --with-cairo --with-cairo-xcb
 --with-xinput2 --with-x-toolkit=gtk3 --without-toolkit-scroll-bars
 'CFLAGS=-O3 -mtune=native -march=native''

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ JPEG LIBOTF LIBSYSTEMD
LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
SOUND SQLITE3 TIFF TREE_SITTER WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM
XRANDR GTK3 ZLIB




Acknowledgement sent to Daniel Mendler <mail@HIDDEN>:
New bug report received and forwarded. Copy sent to rudalics@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to rudalics@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#80043; Package emacs. Full text available.
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Last modified: Mon, 22 Dec 2025 14:15:01 UTC

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