bug#68914: Windows makes Emacs choke on and swallow the WIN keys

[Eli Zaretskii <eliz@gnu.org>]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Date: Sun, 4 Feb 2024 16:32:48 +0300
> 
> But there's something else. I'm not sure if it's the same bug, but 
> something's been iffy about Emacs keyboard input handling on Windows for 
> the last few major versions.

I don't think it's the same issue.  I suggest submitting a separate
bug report with the details.

> Unfortunately I've yet to find a simple reproduction recipe and hence 
> why I haven't filled that one the tracker. The problem is as follows.
> 
> I use a certain piece of software that switches between keyboard layouts 
> by CAPS LOCK. So CAPS LOCK, the feature, is normally mostly inactive on 
> my machine and requires a certain other combination to activate. Emacs 
> normally respects that. Except when it's under a load running lisp code. 
> During that time there are time intervals during which pressing CAPS 
> LOCK would incorrectly set it on for me.
> 
> One way I can reliably reproduce this is by doing M-x list-packages and 
> then tapping CAPS LOCK. At some point it would light up.

In the bug report I suggest to submit, please describe in more detail
how to reproduce this using list-packages.  How to "tap CAPS LOCK" and
what to look for while doing that.  I just tried naïvely to reproduce
that and didn't see any problems, probably because I didn't know where
to look.

> Thus I believe that the input handling intermittently breaks during the 
> high load(lisp evaluation).
> 
> My testing had shown that the last version that does not suffer from 
> this is Emacs 25.

Emacs 26 introduced the low-level keyboard hook.