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bug#745: pop-to-buffer, frames, and input focus
From: |
martin rudalics |
Subject: |
bug#745: pop-to-buffer, frames, and input focus |
Date: |
Thu, 21 Aug 2008 11:04:53 +0200 |
User-agent: |
Thunderbird 2.0.0.16 (Windows/20080708) |
> Consider my original example:
>
> (progn
> (let ((frame (selected-frame))
> (pop-up-frames t))
> (display-buffer (get-buffer-create "foo"))
> (select-frame-set-input-focus frame))
>
> (let ((display-buffer-reuse-frames t))
> (pop-to-buffer "foo")))
>
> First, display-buffer is just used to create two frames. This switches
> (surprisingly) focus to the "foo" buffer. select-frame-set-input-focus
> is used to force the focus back to the "*scratch*" buffer. Then we use
> pop-to-buffer, but the input focus remains (surprisingly) in the
> "*scratch*" buffer.
Ahhh, I can't reproduce that. Evaluating your `progn' moves focus to
the `foo' buffer here (with emacs -Q). So it seems we have a platform
(maybe window manager) specific problem.
> I expect this:
>
> pop-to-buffer should switch the input focus
> display-buffer should not change the input focus
`pop-to-buffer' has the sole additional twist WRT `display-buffer':
(select-window (display-buffer buffer other-window) norecord)
That is, the window used by `display-buffer' should get definitively
selected. So, if `display-buffer' has decided to use "another" frame,
raising that frame, giving it input focus, and implicitly selecting that
frame and the window used for displaying the buffer_must_ have been
already handled by `display-buffer'. In this case, the `select-window'
done by `pop-to-buffer' looks like a NOOP though I didn't verify that.
>> All I wanted to say that raising a
>> frame, giving it input focus, and _not_ selecting it might be difficult.
>
> I see. But this is also not what I expect.
So `pop-to-buffer' raising a frame + giving it input focus + selecting
it is always OK with you?
> pop-to-buffer is more or less (select-window (display-buffer ...)).
> This looks very reasonable, but it doesn't transfer the input focus.
> (under X; in a tty everything works well.)
>
> On the other hand, display-buffer switches sometimes (when a new frame
> is created) the input focus, even when that was not asked for.
>
> Maybe pop-to-buffer could do something like
>
> (let ((window (display-buffer ...)))
> (select-window window)
> (select-frame-set-input-focus (window-frame window)))
>
> That would solve my immediate problem, ...
Does it solve all your problems in this context? I suppose it won't be
of any help when you use `display-buffer' with `pop-up-frames' t :-(
> ... but I suspect that select-window
> should be smarter. My naive interpretation of select-window's C source
> is that select-window tries to select the frame. But apparently forgets
> about the input focus. This may also be the reason why
> save-window-excursion doesn't restore the input focus.
>
> Selecting a window, without giving it the input focus is probably rarely
> needed. Perhaps select-window should transfer the input focus by
> default.
I suppose we can't do that. `select-window' is frequently used to
temporarily switch to another window (compare `save-selected-window').
Shifting input focus to another frame and possibly back to the initial
frame might confuse the window manager.
martin
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/20
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/20
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/20
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/20
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/21
- bug#745: pop-to-buffer, frames, and input focus,
martin rudalics <=
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/21
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/21
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/22
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/22
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/23
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/23
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/24
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/25
- bug#745: pop-to-buffer, frames, and input focus, Helmut Eller, 2008/08/26
- bug#745: pop-to-buffer, frames, and input focus, martin rudalics, 2008/08/27