bug#25875: 26.0.50; Hang logging out of MS-Windows

[Richard Copley <rcopley@gmail.com>]

On 27 February 2017 at 19:46, Richard Copley <rcopley@gmail.com> wrote:
> On 27 February 2017 at 19:39, Ken Brown <kbrown@cornell.edu> wrote:
>> On 2/27/2017 2:30 PM, Richard Copley wrote:
>>>
>>> If you want to block or delay a shutdown in recent
>>> Windows versions you need to use
>>> ShutdownBlockReasonCreate (it's unfortunate, but
>>> we lazy programmers proved we couldn't be trusted,
>>> collectively, to handle WM_QUERY_ENDSESSION
>>> correctly, so the arms race had to be escalated in
>>> order to allow users to shut down their computers
>>> reliably).
>>
>>
>> In spite of the careless mistake in my patch, you could still test Eli's
>> suggestion of using SendMessageTimeout instead of SendMessage, at least in
>> my_show_window.
>
> I can't, not really. Remember, I don't have a recipe.
> I'll never be able to observe whether it's working or not.
> (Am I missing something?)
>
>>> Ken, what was the original change intended to guard
>>> against? What would people be doing with Emacs that
>>> can't simply be abandoned? Did you have a particular
>>> example in mind?
>>
>>
>> Bug#23483.
>
> That's not a real issue, in my opinion. It's already covered,
> by autosave.

There are programs like the OP in #23483 described, which
interrupt a shutdown to ask the user whether to save. Some of
them even call themselves "programmers' text editors" (shudder).
Emacs autosave is and always has been a better solution.

You can shoot yourself in the foot by making small but important
changes and then immediately shutting down Windows. But you'd
almost have to be doing it on purpose.