Layers: Fix crash on opening files saved in clay

Basically we were not tagging the layers and bases as dirty. As usual this will likely change once Depsgraph kicks in. But this will do for now.

source/blender/blenloader/intern/readfile.c

@@ -126,6 +126,7 @@
 #include "BKE_fcurve.h"
 #include "BKE_global.h" // for G
 #include "BKE_group.h"
+#include "BKE_layer.h"
 #include "BKE_library.h" // for which_libbase
 #include "BKE_library_idmap.h"
 #include "BKE_library_query.h"
@@ -5809,9 +5810,12 @@ static void lib_link_scene(FileData *fd, Main *main)
 			lib_link_scene_collection(fd, sce->id.lib, sce->collection);
 
 			for (sl = sce->render_layers.first; sl; sl = sl->next) {
+				/* tag scene layer to update for collection tree evaluation */
+				sl->flag |= SCENE_LAYER_ENGINE_DIRTY;
 				for (Base *base = sl->object_bases.first; base; base = base->next) {
 					/* we only bump the use count for the collection objects */
 					base->object = newlibadr(fd, sce->id.lib, base->object);
+					base->flag |= BASE_DIRTY_ENGINE_SETTINGS;
 				}
 			}
 
@@ -6229,6 +6233,8 @@ static void direct_link_scene(FileData *fd, Scene *sce)
 		link_list(fd, &sl->object_bases);
 		sl->basact = newdataadr(fd, sl->basact);
 		direct_link_layer_collections(fd, &sl->layer_collections);
+		/* tag scene layer to update for collection tree evaluation */
+		BKE_scene_layer_base_flag_recalculate(sl);
 	}
 
 	link_list(fd, &sce->engines_settings);

source/blender/blenloader/intern/versioning_280.c

@@ -173,7 +173,7 @@ void do_versions_after_linking_280(Main *main)
 	}
 }
 
-void blo_do_version_temporary(Main *main)
+static void blo_do_version_temporary(Main *main)
 {
 	BKE_scene_layer_doversion_update(main);
 }