Window placement

[Bill Spitzak]

On 07/02/2014 11:39 AM, Fabrice Rey wrote:
>  > "I am not sure if wayland should allow this, and whether there are
> clients that expect this to work"
> Well, there is at least one application that exists and displays a ring
> of icons under the mouse. So, it needs to tell the compositor to place
> its window to (dx;dy) relatively to the mouse.

The question is: what action triggers it to make this ring of icons appear?