> Also, moving child frames is pretty nice too!

The attached patch now also resizes child frames by dragging their edges
or corners.  One thing that does not work is that when another child
frame is beneath an edge, Emacs selects the child frame beneath the edge
before I can start dragging.  I think that frame/child frame selection
with the mouse is not perfect in the current state in three regards:

- When I do down-mouse-1 in the non-selected root frame, Emacs does
   'mouse-set-point' there.  I think it should do so only for a mouse-1
   so I can back out before releasing the mouse button and obviously use
   the down-mouse-1 for dragging.

- When I have two overlapping child frames and do down-mouse-1 on a
   border of the frame above and that border covers the frame beneath,
   Emacs should never select the frame beneath here.  Not even after I
   release the button.

- Clicking into a child frame anywhere but on a bar does not select it.
   This is uncomfortable and at least does not mimic the behavior of GUI
   frames on all window managers I know.

I'll look into these tomorrow.  Pointers welcome.

martin