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

[Lennart Borgman]

Stefan Monnier wrote:

> >    To me the documentation for `adjust-window-trailing-edge' looks like it
> >    is doing the same thing as `enlarge-window' with preserve-before set to
> >    t.  Am I missing something?
> > They are not the same, because adjust-window-trailing-edge will never
> > delete a window.
> >    
>
> Could you explain the choice of identifier?  I have a hard time understanding
> what "adjust-window-trailing-edge" can mean.  What's a trailing edge?
>  
I think it comes from the structure of the window split tree. I believe 
siblings are ordered from top to bottom or from left to right depending 
on the split direction. So trailing edge is the edge at the bottom or at 
the right.

> Couldn't we just change the `preserve-before' argument (which is new in
> Emacs-22 anyway) instead?
>  
There is another nice feature of the new function: It takes a window 
argument. That means you do not have to set and reset the selected window.