[PATCH weston 3/8] westoy: Use subsurfaces for tooltips instead of transient windows

[Bill Spitzak]

Jasper St. Pierre wrote:

> Transient windows, at least not as they are today, don't exist in
> xdg_shell. Subsurfaces allow for specially placed surfaces relative
> to a window, so use these instead.

So you noticed that subsurfaces and transient windows are very similer, 
huh? :-)

In all seriousness, I strongly suggest that these concepts be merged. 
There is no difference except the compositor is not allowed to insert 
other surfaces in the stacking between a subsurface and it's parent, 
while it is allowed to do this for a transient.