GNU bug report logs - #47731
28.0.50; Switching frame via keyboard does not fire focus change event

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

From: Sean Farley <sean <at> farley.io>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Switching frame via keyboard does not fire focus change event
Date: Mon, 12 Apr 2021 11:17:15 -0500

Here is some testing code:
(defun test--focus-out ()
  (message "FOCUS TEST"))

(add-function :after after-focus-change-function #'test--focus-out)
(make-frame)

On macOS, this code runs fine if you click on the other frame. But if
using the keyboard shortcut Command-` the event doesn't fire. It seems
to be some interaction in the keydown event function where emacs_event
is cleared before the call to windowDidBecomeKey.


In GNU Emacs 28.0.50 (build 2, x86_64-apple-darwin20.3.0, NS appkit-2022.30 Version 11.2.2 (Build 20D80))
 of 2021-03-09 built on laptop
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.2.3

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Message #8 received at 47731 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Sean Farley <sean <at> farley.io>
Cc: Alan Third <alan <at> idiocy.org>, 47731 <at> debbugs.gnu.org
Subject: Re: bug#47731: 28.0.50; Switching frame via keyboard does not fire
 focus change event
Date: Thu, 06 May 2021 11:54:10 +0200

Sean Farley <sean <at> farley.io> writes:

> Here is some testing code:
> (defun test--focus-out ()
>   (message "FOCUS TEST"))
>
> (add-function :after after-focus-change-function #'test--focus-out)
> (make-frame)
>
> On macOS, this code runs fine if you click on the other frame. But if
> using the keyboard shortcut Command-` the event doesn't fire. It seems
> to be some interaction in the keydown event function where emacs_event
> is cleared before the call to windowDidBecomeKey.

I haven't tested the recipe, but perhaps Alan has some comments here
(added to the CCs).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #11 received at 47731 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Sean Farley <sean <at> farley.io>, 47731 <at> debbugs.gnu.org
Subject: Re: bug#47731: 28.0.50; Switching frame via keyboard does not fire
 focus change event
Date: Thu, 6 May 2021 18:57:53 +0100

On Thu, May 06, 2021 at 11:54:10AM +0200, Lars Ingebrigtsen wrote:
> Sean Farley <sean <at> farley.io> writes:
> 
> > Here is some testing code:
> > (defun test--focus-out ()
> >   (message "FOCUS TEST"))
> >
> > (add-function :after after-focus-change-function #'test--focus-out)
> > (make-frame)
> >
> > On macOS, this code runs fine if you click on the other frame. But if
> > using the keyboard shortcut Command-` the event doesn't fire. It seems
> > to be some interaction in the keydown event function where emacs_event
> > is cleared before the call to windowDidBecomeKey.
> 
> I haven't tested the recipe, but perhaps Alan has some comments here
> (added to the CCs).

Interestingly the NS port only generates Emacs events for things that
happen within the NS run loop, which excludes many things that are
initiated by Emacs itself.

I'm not sure how to fix this as I'm not sure why it's set up this way.
-- 
Alan Third

Message #16 received at 47731 <at> debbugs.gnu.org (full text, mbox):

From: Sean Farley <sean <at> farley.io>
To: Alan Third <alan <at> idiocy.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 47731 <at> debbugs.gnu.org
Subject: Re: bug#47731: 28.0.50; Switching frame via keyboard does not fire
 focus change event
Date: Sat, 28 Aug 2021 22:23:35 -0500

Alan Third <alan <at> idiocy.org> writes:

> On Thu, May 06, 2021 at 11:54:10AM +0200, Lars Ingebrigtsen wrote:
>> Sean Farley <sean <at> farley.io> writes:
>>
>> > Here is some testing code:
>> > (defun test--focus-out ()
>> >   (message "FOCUS TEST"))
>> >
>> > (add-function :after after-focus-change-function #'test--focus-out)
>> > (make-frame)
>> >
>> > On macOS, this code runs fine if you click on the other frame. But if
>> > using the keyboard shortcut Command-` the event doesn't fire. It seems
>> > to be some interaction in the keydown event function where emacs_event
>> > is cleared before the call to windowDidBecomeKey.
>>
>> I haven't tested the recipe, but perhaps Alan has some comments here
>> (added to the CCs).
>
> Interestingly the NS port only generates Emacs events for things that
> happen within the NS run loop, which excludes many things that are
> initiated by Emacs itself.
>
> I'm not sure how to fix this as I'm not sure why it's set up this way.

Is there anything I can do to help?

Message #19 received at 47731 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Sean Farley <sean <at> farley.io>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 47731 <at> debbugs.gnu.org
Subject: Re: bug#47731: 28.0.50; Switching frame via keyboard does not fire
 focus change event
Date: Sun, 29 Aug 2021 10:38:38 +0100

On Sat, Aug 28, 2021 at 10:23:35PM -0500, Sean Farley via Bug reports for GNU Emacs, the Swiss army knife of text editors wrote:
> 
> Alan Third <alan <at> idiocy.org> writes:
> 
> > On Thu, May 06, 2021 at 11:54:10AM +0200, Lars Ingebrigtsen wrote:
> >> Sean Farley <sean <at> farley.io> writes:
> >>
> >> > Here is some testing code:
> >> > (defun test--focus-out ()
> >> >   (message "FOCUS TEST"))
> >> >
> >> > (add-function :after after-focus-change-function #'test--focus-out)
> >> > (make-frame)
> >> >
> >> > On macOS, this code runs fine if you click on the other frame. But if
> >> > using the keyboard shortcut Command-` the event doesn't fire. It seems
> >> > to be some interaction in the keydown event function where emacs_event
> >> > is cleared before the call to windowDidBecomeKey.
> >>
> >> I haven't tested the recipe, but perhaps Alan has some comments here
> >> (added to the CCs).
> >
> > Interestingly the NS port only generates Emacs events for things that
> > happen within the NS run loop, which excludes many things that are
> > initiated by Emacs itself.
> >
> > I'm not sure how to fix this as I'm not sure why it's set up this way.
> 
> Is there anything I can do to help?

Probably not at the moment. I think we need to rewrite the NS event
code so it will create events any time, and then test it to see if it
causes problems. I can't see any way it will, but I don't know why
it's written this way, so maybe I'm missing something.
-- 
Alan Third

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