bug#6786: 23.2; Ido-mode switch-to-buffer switches frames

[martin rudalics <rudalics@gmx.at>]

 > emacs -Q; open a new frame using "C-x 5 2" and switch to that frame.
 > Then switch from *scratch* to *Messages* in the first frame.  Enable
 > ido-mode using "M-x ido-mode".  Switch to the second frame and try
 > switching to *Messages*.  The point (and focus) move to the other
 > window.
 >
 > Setting the ido-mode variables `ido-default-file-method' and
 > `ido-default-buffer-method' to 'selected-window does not change this
 > behavior.

What happens when you set `ido-default-buffer-method' to 'other-window?

 > For some reason the gdb frame was split into two windows and I
 > accidentally deleted the wrong one and now the Separate IO is going
 > into the gdb buffer.

Where IO goes to is not related to the window/buffer relationship.

 > However, when I try to to switch back to the *gud* buffer, it
 > puts the point in a completely different window.

What do you mean by this?  That the *gud* buffer is displayed in the
wrong window?

 > I don't want *gud* in
 > that frame, I want it in the one I'm trying to put it in!  NOTE: THIS
 > BEHAVIOR PERSISTS EVEN AFTER SWITCHING OUT OF IDO-SWITCH-BUFFER BY
 > PRESSING "C-b".

What is C-b bound to in this situation?

 > The buffer-switching behavior I submitted earlier also happens when
 > using the Buffers menu.

Could you please try to run `display-buffer' with edebug to trace the
behavior you observe?

Usually this can happen only if (1) `pop-up-frames' is non-nil, (2)
`display-buffer-reuse-frames' is non-nil, or (3) the windows on the
selected frame are dedicated.

martin