Move a registered rendering context to index in surface's render order.
index is the context's final position and is clamped to the registry bounds.
Returns false (and changes nothing) when context is not registered on surface.
Contexts render in list order, so an overlay such as a utility layer should sit
immediately after the scene it composites onto.
Move a registered rendering context to
indexinsurface's render order.indexis the context's final position and is clamped to the registry bounds. Returns false (and changes nothing) whencontextis not registered onsurface. Contexts render in list order, so an overlay such as a utility layer should sit immediately after the scene it composites onto.