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Re: switch-to-buffer-other-frame fails to pop-up window

From: Mark T. Kennedy
Subject: Re: switch-to-buffer-other-frame fails to pop-up window
Date: Fri, 07 Dec 2007 14:41:29 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv: Gecko/20071031 Thunderbird/ Mnenhy/

rms pointed out that the object returned by 'selected-frame' was the correct 
frame object.  but the
lisp printer incorrectly described it with the string "Minibuffer"-blah.  so my
one-help-buffer-per-frame hack does work.


Mark T. Kennedy wrote:
> Drew Adams wrote:
>> Not everyone agrees with my conclusions or preferences in this regard, of
>> course. But I'm glad you find some of the code useful.
>> I understood. Yes, C-x 5 b behaves like C-x 4 b when the buffer is displayed
>> in a single, split frame. C-x 5 b does not create a new frame in that case,
>> so, yes, its meaning of "other frame" is not exactly analogous to C-x 4 b's
>> notion of "other window".
>> No, not at all. Perhaps, however, I complain more than some about Emacs's
>> treatment of frames vs windows.
>> There are others who also typically use frames instead of windows but do so
>> in a different way than I. And they don't necessarily use non-nil
>> `pop-up-frames'. Stefan Monnier is one who uses frames a bit differently - I
>> think he more or less makes each window dedicated (automatically).
>> Some people always use a separate frame for each buffer, not just the first
>> time a buffer is displayed (as I do). That is, they never reuse a frame for
>> a different buffer or split its window to show more than one buffer.
>> Some people who prefer frames don't use a standalone minibuffer (I do).
>> Some people (including me) want deletion of a buffer or window in a
>> one-window frame to also delete the frame. Some prefer the frame to be
>> iconified. Others prefer that a different buffer fill the frame.
> i guess it boils down to whether you see frames and windows as
> orthogonal or hierarchical concepts.  if you see them as orthogonal,
> then you want "c-x 5 b" to always make sure there is a second frame.
> if you see them has hierarchical, then you want to see nested "green"
> behavior: first look for an existing second window, then for an
> existing second frame, and only failing both, create a new frame.
>> There are thus different use cases and preferences. It's unfortunate that
>> Emacs doesn't, in general, play too well with frames, but that's the way it
>> is, so far. I think we'll eventually get it to satisfy everyone out of the
>> box (modulo Customize), but it might take some time. Martin R. has been
>> trying to fix some of the problems with quitting View mode and Help mode,
>> for instance. Some of the code is complex, and it's not always obvious how
>> to satisfy everyone.
> do you think it is worth while to catalog the styles of use?  as a prelude to
> finding a way to better support them?
>> You might want to handle those preference differences using special-display
>> for some buffers. I do something similar for *Completions* and *Help* (in
>> library oneonone.el).
>> I just clone the current Info buffer whenever I want another copy of Info:
>> `M-x clone-buffer'.
> i found that when i hunted through the source.  i call:
> (defun my-info (node)
>   (let ((info-buffer (get-buffer "*info*")))
>     (if info-buffer
>       (progn
>         (set-buffer info-buffer)
>         (let ((new-info-buffer (clone-buffer nil t)))
>           (switch-to-buffer-other-frame new-info-buffer)
>           (info node new-info-buffer)))
>       (info node))))
> from a bash shell function called "info" via emacsclient in order to
> get that behavior.  seems to work right.
>> You don't want *Help* in its own frame; you want it to always open in the
>> current frame. Is that right? That's what happens by default, if
>> `pop-up-frames' is nil, no?
>> emacs -Q
>> C-x d ~
>> C-x 5 2
>> C-x b *scratch*
>> C-h f forward-char ; opens *Help* in the same frame as *scratch*
>> click mouse-1 on the frame with Dired, to select it
>> C-h f backward-char ; opens *Help* in the same frame as ~ (Dired)
>> I see *Help* in each frame. Of course, it has the same content (description
>> of backward-char), since it's the same buffer.
>> It sounds like maybe that's what you are annoyed by: that the buffer is the
>> same in the different help windows. To get around that, I think you will
>> need to do a little juggling - perhaps rename *Help* temporarily at one
>> point or the other (automatically or manually). There is no built-in notion
>> of per-frame help buffers. IIUC, this is not really a problem about frames
>> or windows: your request seems to involve having multiple help buffers, not
>> a single *Help*.
> right - i want a separate help buffer per frame without having to
> rename it by hand.  i tried to do that by hooking help-mode.el's
> "help-buffer" function (which computes the appropriate help buffer
> name) but i could not get it to discover the containing frame object.
> by the time 'help-buffer' was called, the magic minibuffer
> implementation arranged for the magic minibuffer frame (not a
> dedicated minibuffer frame like the one you use but probably a magic
> one to allow sharing of the minibuffer across different real buffer
> frames) to be the 'selected-frame'.
> you can see this by doing "M-: (selected-frame)' after a fresh "emacs
> -Q" and then repeating after popping up a second frame.  once you've
> popped up a second frame, '(selected-frame)' under "M-:" always
> returns the magic minibuffer frame (which i think is a bug).
> /mark

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