Stacking subsurface siblings

[Arnaud Vrac]

Hi,

I'm wondering if a behaviour of weston related to subsurfaces is either a
bug or intended. The protocol description is not clear on what happens in
the following cases:

Suppose I have a shell surface (BLUE) and two subsurfaces (RED, GREEN). I
want to stack them to I get RED, GREEN, BLUE from bottom to top.

If I do:

wl_subsurface_place_below(GREEN->subsurface, BLUE->surface);
wl_subsurface_place_below(RED->subsurface, GREEN->surface);

It works, but if I do:

wl_subsurface_place_below(RED->subsurface, GREEN->surface);
wl_subsurface_place_below(GREEN->subsurface, BLUE->surface);

The order is GREEN, RED, BLUE instead.

Logically the sibling relative order should be kept in the second case, but
it's not. The protocol is not clear on what should happen, what is the
expected result ?

I have attached a small sample to test easily.

-- 
Arnaud
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