CANVAS_DEBUG_NAME (_canvas_group, string_compose ("SV canvas group auto %1", tv.name()));
CANVAS_DEBUG_NAME (canvas_rect, string_compose ("SV canvas rectangle auto %1", tv.name()));
CANVAS_DEBUG_NAME (_canvas_group, string_compose ("SV canvas group auto %1", tv.name()));
CANVAS_DEBUG_NAME (canvas_rect, string_compose ("SV canvas rectangle auto %1", tv.name()));