Created attachment 122602 [details] WAYLAND_DEBUG output Weston renders sub-surfaces with a not mapped parent. According to the Wayland spec a sub-surface should only be mapped if the parent is mapped: "A sub-surface becomes mapped, when a non-NULL wl_buffer is applied and the parent surface is mapped." To reproduce: * run systemsettings5 * go to Desktop Behavior -> Desktop Effects * this creates a sub-surface tree with not mapped parents, but the child is visible Please see the attached log with WAYLAND_DEBUG of systemsettings. The last child which is incorrectly rendered is wl_surface@97 which is a sub-surface to wl_surface@65, but wl_surface@65 never gets a buffer attached. This is of course also a client bug which is reported at https://bugreports.qt.io/browse/QTBUG-52192, but of course the compositor should behave according to the spec ;-)
Series sent upstream: https://patchwork.freedesktop.org/series/19064/ https://lists.freedesktop.org/archives/wayland-devel/2017-February/032946.html
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