change buffer in other frame, multiple monitors

[Sam Halliday]

Hi all,

I have a setup with multiple monitors and when using Emacs I have a frame in 
each monitor.

I recently asked a question on this list and the solution was to set

  (setq-default display-buffer-reuse-frames t)

so that 'next-error would not popup a new window (when the window was already 
open in a new frame).

That worked great! I've recently been extending my use of basic emacs commands 
to include the commands under `C-x 5 ...` (i.e. the "do in the other frame" 
commands)

However, when I type `C-x 5 b` and select a buffer name, I am expecting the 
buffer to be shown in the other frame. But instead, the buffer is opened in a 
new frame.

It would appear that setting 'display-buffer-reuse-frames is not enough to 
force re-use of existing frames and this function is popping up a new one.

Is there something else I must do to re-use frames? I note that 
display-buffer-reuse-frames is deprecated, but I'm not entirely sure how to 
migrate to the new world.

Best regards,
Sam