bug#47731: 28.0.50; Switching frame via keyboard does not fire focus change event

[Sean Farley]

Alan Third <alan@idiocy.org> writes:

> On Thu, May 06, 2021 at 11:54:10AM +0200, Lars Ingebrigtsen wrote:
>> Sean Farley <sean@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?