bug#4293: 23.1; use pop-to-buffer, not switch...other-window, in bookmark.el

[Drew Adams]

>  > In bookmark-jump-other-window and bookmark-bmenu-other-window we call
>  > switch-to-buffer-other-window. We should use pop-to-buffer, instead.
>  >
>  > With non-nil pop-up-frames, switch-to-buffer-other-window creates a
>  > new frame each time, even if the destination buffer is 
>  > already showing in some frame. pop-to-buffer DTRT: it reuses
>  > the existing frame.
> 
> I'm not sure what the problem is here.  
> `switch-to-buffer-other-window'
> has a clear purpose - do _not reuse the selected window_ (which is the
> bookmarks window, IIUC).  OTOH `display-buffer-reuse-frames' non-nil
> should assure that another frame is reused.

Users should not have to customize a global variable, to prevent a new frame
from being used in particular places like this.

As Stefan says repeatedly (paraphrasing), switch-to-buffer-other-window is
almost always the wrong thing to do, and should be replaced in most places by
pop-to-buffer.

Use of switch-to-buffer-other-window is a bug in general, typically made by
someone who doesn't use non-nil pop-up-frames.

In this particular context, there is no reason to use
switch-to-buffer-other-frame.