emacs: Stop Emacs from selecting buffers by raising other frames.

emacs: Stop Emacs from selecting buffers by raising other frames.

The default behaviour of iswitchb, which is otherwise an excellent
thing, is to simply raise a frame if it's already showing the buffer I
want to use.  This is, of course, completely useless if (say) the frame
is actually on a different desktop, or attached to a different display.

Also force the default Emacs display-buffer behaviour, just in case that
becomes crazy later.