can subsurface and shell surface be used together to manage surfaces

[zou lan]

Hi pekka & all

I want to use subsurface to manage the initial position of each surface on
screen, then I want to create shell surface for each wl surface to manage
them seperately, such as response touch event, ivi-shell can modify the
z-order of each surface and move each ivi surface to different displays.

Is it ok to use subsurface like this? If the shell surfaces' z-order have
been modified by desktop shell or ivi-shell,  will the z-order of
subsurfaces be modified too?

thank you!

Best Regards
Nancy
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