Fix T62865: Make Single User after Objects to Scene must be done twice.

Selected status was not properly moved from new object to new created base.
This prevented next steps (making obdata, materials etc. local) to ever
happen.

source/blender/blenkernel/intern/layer.c

@@ -35,6 +35,7 @@
 #include "BKE_main.h"
 #include "BKE_node.h"
 #include "BKE_object.h"
+#include "BKE_scene.h"
 
 #include "DNA_ID.h"
 #include "DNA_space_types.h"
@@ -95,6 +96,7 @@ static Base *object_base_new(Object *ob)
 {
 	Base *base = MEM_callocN(sizeof(Base), "Object Base");
 	base->object = ob;
+	BKE_scene_object_base_flag_sync_from_object(base);
 	return base;
 }