> But I still think that getting a window-state for a window and putting
 > it again into the same window should always be allowed, unless Martin
 > has a good reason why that symmetry is a bad idea.

I tend to agree with you.  But the obvious consequence is that the
WINDOW argument of `window-state-put' could then specify an internal
window that is not the root window of its frame.  In this case plain
`delete-other-windows' would be the wrong action.  I attach a patch.

martin