[Question] Z-order management in Wayland

[Bill Spitzak]

On 07/31/2014 03:21 PM, Carsten Haitzler (The Rasterman) wrote:

>> Wait a second, how is click-to-raise being done?
>
> not by the client - by the compositor. the client has no control over that.

That does not work. The client has to be able to decide whether a mouse 
click will raise the window.

The most obvious thing that does not work is drag & drop.

It makes it impossible for a click to both raise the window and create a 
floating window without blinking.

And unless something MUCH more complicated than the current parent in 
xdg_shell is used, it makes multiple-window software impossible. At 
least a full Directed Acyclic Graph of multiple parents for every 
surface is needed, though I really suspect an entire interpreted 
language is needed to describe window stacking.

This has to be fixed or you are violating the "every frame is perfect" 
design criteria for Wayland.