doc: /* Select buffer BUFFER in some window, preferably a different one.
If BUFFER is nil, then some other buffer is chosen.
If `pop-up-windows' is non-nil, windows can be split to do this.
-If optional second arg OTHER-WINDOW is non-nil, insist on finding another
-window even if BUFFER is already visible in the selected window.
+If optional second arg OTHER-WINDOW is nil, insist on finding another
+window even if BUFFER is already visible in the selected window,
+and ignore `same-window-regexps' and `same-window-buffer-names'.
This uses the function `display-buffer' as a subroutine; see the documentation
of `display-buffer' for additional customization information.