GNU bug report logs - #70046
29.3; ebuffers mini frame loses focus

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Vangelis Evangelou <evangelou <at> gmail.com>
Subject: bug#70046: closed (Re: bug#70046: 29.3; ebuffers mini frame loses
 focus)
Date: Sun, 07 Apr 2024 03:45:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#70046: 29.3; ebuffers mini frame loses focus

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 70046 <at> debbugs.gnu.org.

-- 
70046: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70046
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Po Lu <luangruo <at> yahoo.com>
To: Vangelis Evangelou <evangelou <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 70046-done <at> debbugs.gnu.org
Subject: Re: bug#70046: 29.3; ebuffers mini frame loses focus
Date: Sun, 07 Apr 2024 11:43:29 +0800

Vangelis Evangelou <evangelou <at> gmail.com> writes:

> I have run emacs like this
>
> emacs -Q --eval '(progn (setq x-allow-focus-stealing nil) (ebuffers (find-file "~/fileA") (find-file "~/fileB")))'
>
> This does not solve the issue.

Having debugged this under xfwm4, I've come to the conclusion that this
is the product of two separate bugs in the window manager itself.
Observe the result of running the following code, namely that F1 is
moved above F2 while it continues to possess the input focus:

  (setq f1 (selected-frame)
        f2 (make-frame '((name . "FRAME 2"))))
  (progn
    (raise-frame f2)
    (x-focus-frame f1))

Well-behaved window managers will not focus F2 in response to the call
to `raise-frame', but only raise the frame to the top of the window
stack, leaving the keyboard focus intact, while xfwm4 has adopted a
rather creative interpretation of the meaning of "raise" that holds it
to be synonymous with activating the frame unless "focus stealing
prevention" is enabled.  By itself, this is not sufficient to trigger
your problem, but when windows so acquire the input focus, the new focus
state is not registered by the window manager, with the result that
subsequent requests to activate (i.e. transfer the input focus) to the
previously selected window are disregarded to the extent that they
affect the keyboard focus:

TRACE[events.c:1334] handleConfigureRequest(): window "FRAME 2" (0x40035c)
TRACE[client.c:561] clientAdjustCoordGravity(): client "FRAME 2" (0x40035c)
TRACE[client.c:907] clientMoveResizeWindow(): client "FRAME 2" (0x40035c)
TRACE[display.c:767] myDisplayGetCurrentTime(): timestamp=1371435444
TRACE[hints.c:1305] getXServerTime(): timestamp=1371435444
TRACE[client.c:2595] clientActivate(): client "FRAME 2" (0x40035c)
TRACE[transients.c:336] clientGetTransientFor(): client "FRAME 2" (0x40035c)
TRACE[transients.c:54] clientIsDirectTransient(): client "FRAME 2" (0x40035c)
TRACE[transients.c:54] clientIsDirectTransient(): client "FRAME 2" (0x40035c)
TRACE[stacking.c:537] clientAdjustFullscreenLayer(): unsetting fullscreen layer for  "test.el" (0x40013c)
TRACE[client.c:2374] clientShow(): client "FRAME 2" (0x40035c)
TRACE[transients.c:429] clientListTransientOrModal(): client "FRAME 2" (0x40035c)
TRACE[transients.c:227] clientIsTransientOrModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:177] clientIsTransientFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:227] clientIsTransientOrModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:177] clientIsTransientFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[client.c:2254] clientSetWorkspaceSingle(): client "FRAME 2" (0x40035c)
TRACE[stacking.c:370] clientRaise(): client "FRAME 2" (0x40035c) above (0x0)
TRACE[stacking.c:176] clientGetNextTopMost(): layer 4
TRACE[stacking.c:182] clientGetNextTopMost(): *** stack window "FRAME 2" (0x40035c), layer 4
TRACE[stacking.c:182] clientGetNextTopMost(): *** stack window "test.el" (0x40013c), layer 4
TRACE[transients.c:336] clientGetTransientFor(): client "FRAME 2" (0x40035c)
TRACE[transients.c:54] clientIsDirectTransient(): client "FRAME 2" (0x40035c)
TRACE[transients.c:54] clientIsDirectTransient(): client "FRAME 2" (0x40035c)
TRACE[transients.c:227] clientIsTransientOrModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:177] clientIsTransientFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
DBG[stacking.c:52] clientApplyStackList(): applying stack list
DBG[stacking.c:71] clientApplyStackList():   [5] "FRAME 2" (0x40035c)
DBG[stacking.c:71] clientApplyStackList():   [6] "test.el" (0x40013c)
TRACE[netwm.c:966] clientSetNetClientList(): entering
TRACE[netwm.c:978] clientSetNetClientList(): 2 windows in list for 2 clients
TRACE[focus.c:547] clientSetFocus(): entering
TRACE[transients.c:309] clientGetModalFor(): client "FRAME 2" (0x40035c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "test.el" (0x40013c), client 2 "FRAME 2" (0x40035c)
TRACE[focus.c:562] clientSetFocus(): setting focus to client "FRAME 2" (0x40035c) with timestamp 1371435444
TRACE[focus.c:386] clientAcceptFocus(): client "FRAME 2" (0x40035c)
TRACE[client.c:734] clientConfigure(): client "FRAME 2" (0x40035c) not contrained, type 1
TRACE[client.c:777] clientConfigure(): above
TRACE[stacking.c:370] clientRaise(): client "FRAME 2" (0x40035c) above (0x0)
TRACE[stacking.c:382] clientRaise(): client "FRAME 2" (0x40035c) already raised
DBG[client.c:705] clientSendConfigureNotify(): Sending ConfigureNotify
TRACE[compositor.c:4544] compositorHandleEvent(): event type 23
TRACE[events.c:2303] xfwm4_event_filter(): leaving
TRACE[event_filter.c:117] default_event_filter(): unhandled ConfigureRequest event
TRACE[events.c:2301] xfwm4_event_filter(): entering
TRACE[events.c:2170] handleEvent(): entering
TRACE[events.c:1892] handleClientMessage(): window (0x40013c)
TRACE[client.c:2201] clientGetFromWindow(): client "test.el" (0x40013c)
TRACE[client.c:2207] clientGetFromWindow(): found "test.el" (mode WINDOW)
TRACE[events.c:1940] handleClientMessage(): client "test.el" (0x40013c) has received a NET_ACTIVE_WINDOW event
TRACE[netwm.c:1440] clientHandleNetActiveWindow(): client "test.el" (0x40013c)
TRACE[display.c:782] myDisplayGetTime(): timestamp=1371435444
TRACE[display.c:791] myDisplayGetLastUserTime(): timestamp=1371435444
TRACE[netwm.c:1454] clientHandleNetActiveWindow(): time of event received is 1371435444, current XServer time is 1371435444
TRACE[client.c:2595] clientActivate(): client "test.el" (0x40013c)
TRACE[transients.c:336] clientGetTransientFor(): client "test.el" (0x40013c)
TRACE[transients.c:54] clientIsDirectTransient(): client "test.el" (0x40013c)
TRACE[transients.c:54] clientIsDirectTransient(): client "test.el" (0x40013c)
TRACE[client.c:2374] clientShow(): client "test.el" (0x40013c)
TRACE[transients.c:429] clientListTransientOrModal(): client "test.el" (0x40013c)
TRACE[transients.c:227] clientIsTransientOrModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:177] clientIsTransientFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:227] clientIsTransientOrModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:177] clientIsTransientFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[client.c:2254] clientSetWorkspaceSingle(): client "test.el" (0x40013c)
TRACE[stacking.c:370] clientRaise(): client "test.el" (0x40013c) above (0x0)
TRACE[stacking.c:176] clientGetNextTopMost(): layer 4
TRACE[stacking.c:182] clientGetNextTopMost(): *** stack window "test.el" (0x40013c), layer 4
TRACE[stacking.c:182] clientGetNextTopMost(): *** stack window "FRAME 2" (0x40035c), layer 4
TRACE[transients.c:336] clientGetTransientFor(): client "test.el" (0x40013c)
TRACE[transients.c:54] clientIsDirectTransient(): client "test.el" (0x40013c)
TRACE[transients.c:54] clientIsDirectTransient(): client "test.el" (0x40013c)
TRACE[transients.c:227] clientIsTransientOrModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:177] clientIsTransientFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
DBG[stacking.c:52] clientApplyStackList(): applying stack list
DBG[stacking.c:71] clientApplyStackList():   [5] "test.el" (0x40013c)
DBG[stacking.c:71] clientApplyStackList():   [6] "FRAME 2" (0x40035c)
TRACE[netwm.c:966] clientSetNetClientList(): entering
TRACE[netwm.c:978] clientSetNetClientList(): 2 windows in list for 2 clients
TRACE[focus.c:547] clientSetFocus(): entering
TRACE[transients.c:309] clientGetModalFor(): client "test.el" (0x40013c)
TRACE[transients.c:205] clientIsModalFor(): client 1 "FRAME 2" (0x40035c), client 2 "test.el" (0x40013c)
TRACE[focus.c:562] clientSetFocus(): setting focus to client "test.el" (0x40013c) with timestamp 1371435444
TRACE[focus.c:572] clientSetFocus(): client "test.el" (0x40013c) is already focused, ignoring request

and in consequence this portion of ediff-recenter:

      (progn
	(if (window-live-p ediff-window-A)
	    (raise-frame (window-frame ediff-window-A)))
	(if (window-live-p ediff-window-B)
	    (raise-frame (window-frame ediff-window-B)))
	(if (window-live-p ediff-window-C)
	    (raise-frame (window-frame ediff-window-C)))))
  (if (and (display-graphic-p)
	   (frame-live-p ediff-control-frame)
	   (not ediff-use-long-help-message)
	   (not (ediff-frame-iconified-p ediff-control-frame)))
      (if (fboundp 'select-frame-set-input-focus)
	  (select-frame-set-input-focus ediff-control-frame)
	(raise-frame ediff-control-frame)
	(select-frame ediff-control-frame)))

whose purpose is to preserve the position of the ediff control frame
relative to the remainder instead prompts the window manager to transfer
the input focus to a diff-displaying frame, before being left with no
means of restoring the input focus to its original owner.  It is also
reproducible consistently with Emacs 28.1, so I suggest reporting this
issue to the xfwm developers; closing.

[Message part 3 (message/rfc822, inline)]

From: Vangelis Evangelou <evangelou <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3; ebuffers mini frame loses focus
Date: Thu, 28 Mar 2024 08:36:56 +0000

[Message part 4 (text/plain, inline)]

When using ebuffers with the default settings, going up and down on
differences by pressing n and p switches focus to the buffers that are
being compared. As an example, run the following commands in terminal:

ping -c 10 example.com > ~/fileA
ping -c 10 example.com > ~/fileB
emacs -Q --eval '(ebuffers (find-file "~/fileA") (find-file "~/fileB"))'

and then press n and p to navigate through the differences. You will notice
that focus switches to the buffers. It doesn't happen always.

In GNU Emacs 29.3 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw scroll bars) of 2024-03-25 built on XXX
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Linux Mint 21.3

Configured using:
 'configure --without-pop --without-kerberos --without-kerberos5
 --without-hesiod --without-mail-unlink --without-mailhost
 --with-x-toolkit=lucid --with-file-notification=inotify --with-x
 --with-modules --with-json --with-xft --with-native-compilation=aot'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER
WEBP X11 XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $LC_TIME: en_GB.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils comp comp-cstr
warnings icons subr-x rx cl-seq cl-macs gv cl-extra help-mode bytecomp
byte-compile ediff ediff-merg ediff-mult ediff-wind ediff-diff
ediff-help ediff-init cl-loaddefs cl-lib ediff-util rmc iso-transl
tooltip cconv eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo x-toolkit x multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 89509 8639)
 (symbols 48 7936 0)
 (strings 32 23350 1264)
 (string-bytes 1 698046)
 (vectors 16 17470)
 (vector-slots 8 355883 12474)
 (floats 8 43 52)
 (intervals 56 244 0)
 (buffers 984 15))

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