GNU bug report logs - #40639
26.3; Child frame border color not rendered when child frame has no minibuffer

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Alexander Miller <alexanderm <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.3; Child frame border color not rendered when child frame has no
 minibuffer
Date: Wed, 15 Apr 2020 12:10:58 +0200

Starting from emacs -q run this:

(set-face-background 'internal-border "red")
(select-window
 (display-buffer-in-child-frame
  (get-buffer-create "*scratch*")
  '((child-frame-parameters
     .
     ((left . 100)
      (top  . 100)
      (height . 10)
      (width . 100)
      (minibuffer . nil)
      (internal-border-width . 300))))))

The child frame will pop up and its large border covers a large parts of
the buffer, but it is the same color as the background, not the red we
have set above. The only way I found to fix the color is to click on the
child frame. Calling the likes of select-frame, x-focus-frame,
select-frame-set-input-focus does not help. When the minibuffer
parameter is set to t the border is drawn as expected.

If the call to select-window is left out the border will have the wrong
color regardless of minibuffer setting. Clicking the child frame will
likewise change it to red.

It could be that this is related to my unorthodox wm setup: I am running
xfce with i3wm replacing xfwm4.

      In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.10)
 of 2019-08-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12007000
Recent messages:
Config loaded in 0.8095128536224365s
For information about GNU Emacs and the GNU system, type C-h C-a.
Turn on helm-projectile key bindings

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt'
 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD LCMS2

Important settings:
  value of $LC_COLLATE: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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  evil-mode: t
  evil-local-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  prettify-symbols-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
  line-number-mode: t
  transient-mark-mode: t

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Message #8 received at 40639 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Alexander Miller <alexanderm <at> web.de>, 40639 <at> debbugs.gnu.org
Subject: Re: bug#40639: 26.3; Child frame border color not rendered when child
 frame has no minibuffer
Date: Wed, 15 Apr 2020 19:20:45 +0200

> Starting from emacs -q run this:
>
> (set-face-background 'internal-border "red")
> (select-window
>   (display-buffer-in-child-frame
>    (get-buffer-create "*scratch*")
>    '((child-frame-parameters
>       .
>       ((left . 100)
>        (top  . 100)
>        (height . 10)
>        (width . 100)
>        (minibuffer . nil)
>        (internal-border-width . 300))))))
>
> The child frame will pop up and its large border covers a large parts of
> the buffer, but it is the same color as the background, not the red we
> have set above. The only way I found to fix the color is to click on the
> child frame. Calling the likes of select-frame, x-focus-frame,
> select-frame-set-input-focus does not help. When the minibuffer
> parameter is set to t the border is drawn as expected.
>
> If the call to select-window is left out the border will have the wrong
> color regardless of minibuffer setting. Clicking the child frame will
> likewise change it to red.
>
> It could be that this is related to my unorthodox wm setup: I am running
> xfce with i3wm replacing xfwm4.

I'm aware of this bug and see it frequently when debugging child frame
issues.  Unfortunately, I don't know what's causing it because I have no
idea how face remapping is supposed to work internally.  What happens is
that when x_clear_under_internal_border runs this part

      int face_id =
	!NILP (Vface_remapping_alist)
	? lookup_basic_face (NULL, f, INTERNAL_BORDER_FACE_ID)
	: INTERNAL_BORDER_FACE_ID;
      struct face *face = FACE_FROM_ID_OR_NULL (f, face_id);

      block_input ();

      if (face)
	{
	  unsigned long color = face->background;

the value of color for a new normal frame is for a few calls white but
switches to red before the frame appears on the display.  A child frame
usually must be explicitly focused before its border becomes red (I
don't necessarily need the mouse for that purpose, C-x 5 o works too).

Maybe our experts in face remapping have an idea.

martin

Message #11 received at 40639 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: alexanderm <at> web.de, 40639 <at> debbugs.gnu.org
Subject: Re: bug#40639: 26.3;
 Child frame border color not rendered when child frame has no
 minibuffer
Date: Wed, 15 Apr 2020 20:32:33 +0300

> From: martin rudalics <rudalics <at> gmx.at>
> Date: Wed, 15 Apr 2020 19:20:45 +0200
> 
>        int face_id =
> 	!NILP (Vface_remapping_alist)
> 	? lookup_basic_face (NULL, f, INTERNAL_BORDER_FACE_ID)
> 	: INTERNAL_BORDER_FACE_ID;
>        struct face *face = FACE_FROM_ID_OR_NULL (f, face_id);
> 
>        block_input ();
> 
>        if (face)
> 	{
> 	  unsigned long color = face->background;
> 
> the value of color for a new normal frame is for a few calls white but
> switches to red before the frame appears on the display.  A child frame
> usually must be explicitly focused before its border becomes red (I
> don't necessarily need the mouse for that purpose, C-x 5 o works too).
> 
> Maybe our experts in face remapping have an idea.

I don't think face mapping is directly involved, this sounds like some
X event causes the change.

Message #14 received at 40639 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: alexanderm <at> web.de, 40639 <at> debbugs.gnu.org
Subject: Re: bug#40639: 26.3; Child frame border color not rendered when child
 frame has no minibuffer
Date: Thu, 16 Apr 2020 10:31:53 +0200

> I don't think face mapping is directly involved, this sounds like some
> X event causes the change.

You are probably right.  Digging into this a bit further I found that
calling gui_consider_frame_title for child frames fixes it.  So it looks
like a combination of explicitly selecting a frame via Fselect_window of
its selected window and subsequently calling init_iterator would orderly
rebuild the face cache of that frame.  A wild guess, I know ...

martin

Message #17 received at 40639 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: 40639 <at> debbugs.gnu.org
Cc: alexanderm <at> web.de, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#40639: 26.3; Child frame border color not rendered when child
 frame has no minibuffer
Date: Sat, 18 Apr 2020 10:51:45 +0200

tags 40639 fixed
close 40639 28.1
quit

> Digging into this a bit further I found that
> calling gui_consider_frame_title for child frames fixes it.

Hopefully fixed now on master by calling gui_consider_frame_title for
child frames too.

IMHO this is a bug when refreshing the face cache.  We postpone that for
a new frame until we call gui_consider_frame_title for that frame.
Until then, any earlier attempts to free realized faces are inhibited by
inhibit_free_realized_faces.  It's easy to see the effect with Emacs'
native tooltip frames by evaluating with emacs -Q

(progn
  (setq x-gtk-use-system-tooltips nil)
  (set-face-background 'internal-border "red"))

and moving the mouse to some text on the mode line.  The red border will
show up only after I clicked at least once into the containing frame.

If the bug affects the internal border only, it's minor only.  I don't
know if it may affect more important faces as well.

Closing this bug, martin

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