Re: minibuffer-selected-buffer

[Richard Stallman]

    Suppose that for a certain problem the completion table is always
    generated dynamically by calling an appropriate function. Usually,
    windows are split in order to display the completion buffer.
    However, I can imagine that a user wants to have only one window
    displayed that is showing the completions he can choose from. Of
    course, this requires that either the user explicitely deletes
    minibuffer-selected-window.

I guess it would have to do something else to decide which buffer
to use, not based on minibuffer-selected-window or anything like that.
It could arbitrarily pick some other window in the right frame
and use its buffer.

I wouldn't bother handling this case, though.