GNU bug report logs - #15469
24.3; emacsclient -c fails to grab focus when asking “Revert buffer from file?”

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Package: emacs; Reported by: Anders Kaseorg <andersk@HIDDEN>; Keywords: confirmed; dated Fri, 27 Sep 2013 00:02:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#15469: 24.3; emacsclient -c fails to grab focus when asking
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 Content preview:  Lars Ingebrigtsen <larsi@HIDDEN> writes: > I guess we'll
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 did, so I've now reverted the change and reopened this bug report. 
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Lars Ingebrigtsen <larsi@HIDDEN> writes:

> I guess we'll find out whether this regresses something when people
> start using it.

It did, so I've now reverted the change and reopened this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.
Removed tag(s) fixed and patch. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
bug No longer marked as fixed in versions 28.1 and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.
bug marked as fixed in version 28.1, send any further explanations to 15469 <at> debbugs.gnu.org and Anders Kaseorg <andersk@HIDDEN> Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) fixed. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
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Subject: Re: bug#15469: 24.3; emacsclient -c fails to grab focus when asking
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Eli Zaretskii <eliz@HIDDEN> writes:

> There be dragons: we've had several changes in this area, each one of
> them caused unintended "misfeatures" in other use cases.

Indeed.

> So I would suggest to review bug reports related to emacsclient for
> the recent, say, 3 years, and make sure the various use cases
> described there still work correctly, both with TTY frames and GUI
> frames.

Well, that sounds like work, but I did go through the VC log for
server.el and ran through the cases for reproduction of bugs fixed over
the past two years, and they were not affected by this change, so I went
ahead and applied it.

I guess we'll find out whether this regresses something when people
start using it.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.

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Subject: Re: bug#15469: 24.3; emacsclient -c fails to grab focus when asking
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: 15469 <at> debbugs.gnu.org,  andersk@HIDDEN
> Date: Sun, 06 Dec 2020 17:14:45 +0100
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> So just raising the frame before we process the buffers seems to fix the
> problem for me.
> 
> Comments?

There be dragons: we've had several changes in this area, each one of
them caused unintended "misfeatures" in other use cases.  So I would
suggest to review bug reports related to emacsclient for the recent,
say, 3 years, and make sure the various use cases described there
still work correctly, both with TTY frames and GUI frames.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.
Added tag(s) patch. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#15469: 24.3; emacsclient -c fails to grab focus when asking
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 Content preview: Eli Zaretskii <eliz@HIDDEN> writes: >> > We ask the question
 before we switch to the new frame, so I guess the >> > question appears in
 the previous frame? >> >> No, it appears in the new frame. > > OK, but still:
 we raise the frame onl [...] 
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Eli Zaretskii <eliz@HIDDEN> writes:

>> > We ask the question before we switch to the new frame, so I guess the
>> > question appears in the previous frame?
>> 
>> No, it appears in the new frame.
>
> OK, but still: we raise the frame only when we are done, right?

Yes.  I instrumented raise-frame, and it was indeed called after I
answered "yes" to the "revert" question:

Debugger entered--entering a function:
* raise-frame(#<frame  *Minibuf-1* 0x5652caf5a498>)
  select-frame-set-input-focus(#<frame  *Minibuf-1* 0x5652caf5a498>)
  server-switch-buffer(#<buffer foo> nil nil #<frame  *Minibuf-1* 0x5652caf5a498>)
  server-execute(#<process server <2>> (("/tmp/foo")) nil nil t #<frame  *Minibuf-1* 0x5652caf5a498> window-system)
  #f(compiled-function () #<bytecode -0x1de923e1af168e73>)()
  server-execute-continuation(#<process server <2>>)
  server-process-filter(#<process server <2>> "-env SHELL=/bin/bash -env SESSION_MANAGER=local/xo...")

So just raising the frame before we process the buffers seems to fix the
problem for me.

Comments?

diff --git a/lisp/server.el b/lisp/server.el
index 2fd94552dd..aa7297ba48 100644
--- a/lisp/server.el
+++ b/lisp/server.el
@@ -1328,6 +1328,8 @@ server-execute
   ;; inhibit-quit flag, which is good since `commands' (as well as
   ;; find-file-noselect via the major-mode) can run arbitrary code,
   ;; including code that needs to wait.
+  (when (and frame server-raise-frame)
+    (select-frame-set-input-focus frame))
   (with-local-quit
     (condition-case err
         (let ((buffers (server-visit-files files proc nowait)))
@@ -1676,9 +1678,7 @@ server-switch-buffer
                   (switch-to-buffer next-buffer))
 	      ;; After all the above, we might still have ended up with
 	      ;; a minibuffer/dedicated-window (if there's no other).
-	      (error (pop-to-buffer next-buffer)))))))
-    (when server-raise-frame
-      (select-frame-set-input-focus (window-frame)))))
+	      (error (pop-to-buffer next-buffer)))))))))
 
 ;;;###autoload
 (defun server-save-buffers-kill-terminal (arg)


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: andersk@HIDDEN,  15469 <at> debbugs.gnu.org
> Date: Sun, 06 Dec 2020 16:44:08 +0100
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > We ask the question before we switch to the new frame, so I guess the
> > question appears in the previous frame?
> 
> No, it appears in the new frame.

OK, but still: we raise the frame only when we are done, right?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.

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Subject: Re: bug#15469: 24.3; emacsclient -c fails to grab focus when asking
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Eli Zaretskii <eliz@HIDDEN> writes:

> We ask the question before we switch to the new frame, so I guess the
> question appears in the previous frame?

No, it appears in the new frame.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.

Message received at 15469 <at> debbugs.gnu.org:


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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Sun, 06 Dec 2020 16:27:30 +0100
> Cc: 15469 <at> debbugs.gnu.org
> 
> > 1. emacs -Q /tmp/foo
> > 2. M-x server-start
> > 3. Type some text into the buffer; do not save.
> > 4. Click outside the Emacs window to unfocus it.
> > 5. Click inside the Emacs window to focus it.
> > 6. Click outside the Emacs window to unfocus it.
> > 7. Modify /tmp/foo outside Emacs.
> > 8. emacsclient -c /tmp/foo
> > 9. An _unfocused_ Emacs window pops up to ask “Revert buffer from file
> > /tmp/foo?”.
> 
> (This bug report unfortunately got no response at the time.)
> 
> I can confirm that this bug is still present in Emacs 28, but I have not
> tried to debug it.  Anybody with a guess at what's going on?

We ask the question before we switch to the new frame, so I guess the
question appears in the previous frame?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.
Added tag(s) confirmed. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Anders Kaseorg <andersk@HIDDEN>
Subject: Re: bug#15469: 24.3; emacsclient -c fails to grab focus when asking
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 Content preview:  Anders Kaseorg <andersk@HIDDEN> writes: > When using Emacs
    in server mode and ‘emacsclient -c’ as my preferred > editor, new windows
    opened by emacsclient often fail to grab keyboard > focus, correlated with
    Emacs asking minibuffer ques [...] 
 
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Anders Kaseorg <andersk@HIDDEN> writes:

> When using Emacs in server mode and =E2=80=98emacsclient -c=E2=80=99 as m=
y preferred
> editor, new windows opened by emacsclient often fail to grab keyboard
> focus, correlated with Emacs asking minibuffer questions like =E2=80=9CRe=
vert
> buffer from file?=E2=80=9D as the file is opened (e.g. on .git/COMMIT_EDI=
TMSG
> which is frequently modified both inside and outside Emacs).  I can
> reproduce this reliably as follows:
>
> 1. emacs -Q /tmp/foo
> 2. M-x server-start
> 3. Type some text into the buffer; do not save.
> 4. Click outside the Emacs window to unfocus it.
> 5. Click inside the Emacs window to focus it.
> 6. Click outside the Emacs window to unfocus it.
> 7. Modify /tmp/foo outside Emacs.
> 8. emacsclient -c /tmp/foo
> 9. An _unfocused_ Emacs window pops up to ask =E2=80=9CRevert buffer from=
 file
> /tmp/foo?=E2=80=9D.

(This bug report unfortunately got no response at the time.)

I can confirm that this bug is still present in Emacs 28, but I have not
tried to debug it.  Anybody with a guess at what's going on?

The new frame that's popped up does have focus, as expected, if the
"revert buffer" query isn't done.

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.

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


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Date: Thu, 26 Sep 2013 20:01:15 -0400
From: Anders Kaseorg <andersk@HIDDEN>
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When using Emacs in server mode and =E2=80=98emacsclient -c=E2=80=99 as my preferred 
editor, new windows opened by emacsclient often fail to grab keyboard 
focus, correlated with Emacs asking minibuffer questions like =E2=80=9CRevert 
buffer from file=3F=E2=80=9D as the file is opened (e.g. on .git/COMMIT_EDITMSG 
which is frequently modified both inside and outside Emacs).  I can 
reproduce this reliably as follows:

1. emacs -Q /tmp/foo
2. M-x server-start
3. Type some text into the buffer; do not save.
4. Click outside the Emacs window to unfocus it.
5. Click inside the Emacs window to focus it.
6. Click outside the Emacs window to unfocus it.
7. Modify /tmp/foo outside Emacs.
8. emacsclient -c /tmp/foo
9. An _unfocused_ Emacs window pops up to ask =E2=80=9CRevert buffer from file 
/tmp/foo=3F=E2=80=9D.

(If I skip step 5, or if I replace step 5 with clicking on the _title 
bar_ of the first Emacs window to focus it, then the new window has no 
trouble grabbing focus; I can only reproduce when clicking _inside_ the 
Emacs window to focus it.)

My window manager, if it matters, is gnome-shell 3.8.4-0ubuntu5.

In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.2)
  of 2013-07-26 on roseapple, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11402901
System Description:	Ubuntu Saucy Salamander (development branch)

Configured using:
  `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
  '--prefix=3D/usr' '--sharedstatedir=3D/var/lib' '--libexecdir=3D/usr/lib'
  '--localstatedir=3D/var/lib' '--infodir=3D/usr/share/info'
  '--mandir=3D/usr/share/man' '--with-pop=3Dyes'
 
'--enable-locallisppath=3D/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
  '--with-crt-dir=3D/usr/lib/x86_64-linux-gnu' '--with-x=3Dyes'
  '--with-x-toolkit=3Dgtk3' '--with-toolkit-scroll-bars'
  'build_alias=3Dx86_64-linux-gnu' 'CFLAGS=3D-g -O2 -fstack-protector
  --param=3Dssp-buffer-size=3D4 -Wformat -Werror=3Dformat-security -Wall'
  'LDFLAGS=3D-Wl,-Bsymbolic-functions -Wl,-z,relro'
  'CPPFLAGS=3D-D_FORTIFY_SOURCE=3D2''

Important settings:
   value of $LC_MONETARY: en_US.UTF-8
   value of $LC_NUMERIC: en_US.UTF-8
   value of $LC_TIME: en_US.UTF-8
   value of $LANG: en_US.UTF-8
   value of $XMODIFIERS: @im=3Dnone
   locale-coding-system: utf-8-unix
   default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
   tooltip-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
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent input:
M-x s e r v e r - s t a r t <return> f o o <return>=3D20
<down-mouse-1> <mouse-1> <help-echo> <down-mouse-1>=3D20
<mouse-movement> <mouse-1> n o <return> M-x r e p o=3D20
r t - e m a c s - b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
(New file)
When done with a buffer, type C-x #

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils server time-date tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)
Acknowledgement sent to Anders Kaseorg <andersk@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#15469; Package emacs. Full text available.
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