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compositor: fix endless recursion in scene-graph printing

Michael Olbrich requested to merge mol/weston:scene-graph into master

If a surface has subsurfaces then the surface itself is in the subsurface list. To avoid printing it again there is a check to skip the child view, if it is the same as the current view.

However, this fails when a surface with subsurfaces has two (or more) views: The check to skip the parent fails for the other view and the two views are printed again and again until a stack overflow occurs.

So instead check if the parent view of the subsurface view is the current view. This way, any view that does not belong to a real subsurface is skipped.

As a side effect, this ensures that each view of the subsurfaces is only printed once at the correct place in the hierarchy.

Signed-off-by: Michael Olbrich m.olbrich@pengutronix.de

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