Do not map subsurface before parent is mapped
According to the protocol, subsurfaces become mapped, among other things, when their parent is mapped. Wlroots does such a check if the parent is a subsurface, but not if it is a "toplevel" surface.
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According to the protocol, subsurfaces become mapped, among other things, when their parent is mapped. Wlroots does such a check if the parent is a subsurface, but not if it is a "toplevel" surface.