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bug#11566: 24.0.97; `read-from-minibuffer': focus to standalone minibuff

From: martin rudalics
Subject: bug#11566: 24.0.97; `read-from-minibuffer': focus to standalone minibuffer frame?
Date: Tue, 29 May 2012 11:43:00 +0200

>> IIUC `read-from-minibuffer' uses `redirect-frame-focus' to send the
>> keystrokes to the minibuffer window.  If that function works
>> for you in general, we likely have a race condition in this special case.
> If so, what could a solution/fix be for it?

You didn't tell us whether it works for you "in general".  If you work
with two frames for "some time" does `redirect-frame-focus' what it is
supposed to do?  If it doesn't we have a strange situation where, citing
from Ito's comment in bug#11513,

> > When I run lower-frame function in Emacs frame interactively, Emacs
> > frame is brought behind of other application window(s) but has focus.
> > Key inputs are passed to lowered frame.  I tested 4 Windows PC, and
> > all PCs show the same behavior.

so Windows OT1H handles key input passed to a frame that is not in the
foreground and OTOH doesn't pass key input to another frame even if
explicitly asked to do so.

>>  > Shouldn't [`read-from-minibuffer'] have the responsibility
>>  > here to give the minibuffer frame the focus?
>> Yes.  But the window manager must not intercept it.
> But that's what seems to be happening (intercept or interrupt or some such).

That's what we have to find out.

>> Try the sit-for approach.  Try to make a standalone example like
>> (let ((old-frame ... some existing frame))
>>    (make-frame)
>>    (redirect-frame-focus old-frame))
>> and see whether it fails giving focus to `old-frame'.
> Still not sure what you mean by using `sit-for' (how/where?).  But I tried 
> simple example, and yes, it systematically fails to give focus to `old-frame'.
> The newly created frame keeps the focus - every time.

I suppose my example was just silly.  Maybe you should try again with

(let ((old-frame (selected-frame))
      (new-frame (make-frame)))
  (redirect-frame-focus new-frame old-frame))

I don't know anything about `redirect-frame-focus' and can't test it
reliably here because I'm using special autoraise-frame settings which
likely interfere with any such focus redirection.


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