GNU bug report logs - #8116
24.0.50; `minibuffer-message': ignore mouse-up event for `sit-for' on Windows?

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Message #22 received at 8116 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 8116 <at> debbugs.gnu.org, drew.adams <at> oracle.com
Subject: Re: bug#8116: 24.0.50;
 `minibuffer-message': ignore mouse-up event for `sit-for'?
Date: Sun, 18 Jul 2021 09:50:52 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Sun, 18 Jul 2021 02:30:08 +0200
> Cc: 8116 <at> debbugs.gnu.org
> 
> "Drew Adams" <drew.adams <at> oracle.com> writes:
> 
> > If you pop up a menu (e.g. using `x-popup-menu') and one of its items
> > calls `minibuffer-message', the user will never see the message,
> > presumably because the call to `sit-for' in `minibuffer-message' sees
> > the mouse-up event (from choosing the menu item) as user input,
> > canceling the `sit-for' timeout.
> 
> Do you have a test case that demonstrates the problem?

You won't be able to see this on any system but MS-Windows.  On
Windows, the Emacs menus are implemented in a way that has this
unfortunate side effect: we basically preempt the Emacs command loop
for as long as the menu stays open.

If someone wants to redesign how Emacs menus are implemented on
Windows, I think that would be very welcome.  But until that happens,
this is Emacs "functioning as designed", not some easily-fixed bug.

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