Re: mouse-drag-mode-line should maybe use window-tree

[Lennart Borgman]

Richard M. Stallman wrote:

> For this meaning, I think it is better to use a different function.
> However, maybe we should eliminate the PRESERVE-BEFORE argument now.
> It was an attempt at doing what we have now done better; perhaps
> we should get rid of it rather than release it.
>  
No objections to that, I think I have switched to the new function 
everywhere.