bug#20206: 25.0.50; [PATCH] keep diff-mode's window visible when we visit sources from diff-mode

[martin rudalics]

> -  (pop-to-buffer (current-buffer))

Something must be wrong here.  According to its doc-string
`pop-to-buffer' should

"Select buffer BUFFER in some window, preferably a different one."

But I nowhere see that it tries to enforce that.  Am I blind?  And
`display-buffer' should not use the selected window either, after all
it's likely the most recently used one.  Could you please debug this in
order to explain why the selected window gets used in all these cases?

> +  (pop-to-buffer (current-buffer) '(display-buffer-use-some-window 
(inhibit-same-window . t)))

In any case `display-buffer-use-some-window' as sole action doesn't look
right.  It should be preceded by `display-buffer-reuse-window' and
`display-buffer-pop-up-window'.  And `pop-to-buffer' should do that
already.

Thanks, martin