Re: moving window handling into lisp

[martin rudalics]

> What is problematic with that if we save pointers to the old structure
> as I suggested? (I am not saying there aren't any problem, I just
> don't know what kind of problem you see.)

We would have to save multiple before-frame-size-change window
configurations, compare them in a non-trivial way at every subsequent
frame-resizing (we probably should not revert explicit window-resizing
operations that happened since the save but probably ignore
`fit-window-to-buffer' operations), and get rid of saved configurations
when they are no more useful.  All this is very non-trivial.

martin