bug#65116: 29.1; query-replace-read-args fails reading second arg in detached minibuf

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 12 Jan 2024 21:44:11 +0000
> Cc: 65116@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>, acm@muc.de
> From: Alan Mackenzie <acm@muc.de>
> 
> Hello, Jim.
> 
> On Fri, Jan 12, 2024 at 12:57:42 -0600, Jim Rees wrote:
> > Well that's a relief. I do have an unusual setup with detached minibuf and
> > focus follows mouse. There has been a lot of churn in replace.el and frame.c
> > lately and I keep hoping the bug will go away on its own. I don't really
> > understand all the focus changes in the code but I do see why they are
> > necessary.
> 
> > I have a workaround, I have bound this to a key and use it to re-focus to
> > the minibuf so I can enter the 'to' text:
> 
> > (select-frame-set-input-focus (window-frame (minibuffer-window)))
> 
> > But that requires manual intervention so for now I'm sticking with 28.1.
> 
> I've been playing with the setup for an hour or two.  It seems that
> performing some action in the minibuffer (say, M-x auto-revert-mode, but
> anything will do) causes M-% to work properly.  But then, the moment the
> mouse leaves the active frame or window (I'm not sure which), M-% no
> longer works properly, until the next minibuffer action.
> 
> I know this isn't much help to you, but it should be a help to us,
> tracking down what's going wrong.

If this is WM-specific, maybe Po Lu (CC'ed) could help us understand
what happens here?  Perhaps some message we expect from X is not being
received in this scenario?