> To be 100% clear, let me try to restate exactly what I have in mind.
 >
 > I want to call something like
 >
 >   (pop-to-buffer BUFFER
 >     '((display-buffer-reuse-window display-buffer-pop-up-window)
 >       (reuse-indirect . t)))
 >
 > 1. If there is a window displaying BUFFER, switch to that window
 > 2. If there is a window that is an indirect buffer of BUFFER or that
 >     shares the same base buffer with BUFFER, switch to that window

I included the facility that if there is a window whose buffer is the
base buffer of BUFFER use that window.  See the attached diff which I
did not test very thoroughly.

martin