Fix cycles viewport render getting stuck with driven/animated nodes, the updated

flag would not get cleared due to the nodetree not being a real datablock.

source/blender/blenkernel/BKE_node.h

@@ -314,6 +314,8 @@ void              ntreeUserIncrefID(struct bNodeTree *ntree);
 void              ntreeUserDecrefID(struct bNodeTree *ntree);
 
 
+struct bNodeTree *ntreeFromID(struct ID *id);
+
 void              ntreeMakeLocal(struct bNodeTree *ntree);
 int               ntreeHasType(struct bNodeTree *ntree, int type);
 void              ntreeUpdateTree(struct bNodeTree *ntree);

source/blender/blenkernel/intern/depsgraph.c

@@ -1940,13 +1940,13 @@ void DAG_scene_sort(Main *bmain, Scene *sce)
 static void lib_id_recalc_tag(Main *bmain, ID *id)
 {
 	id->flag |= LIB_ID_RECALC;
-	bmain->id_tag_update[id->name[0]] = 1;
+	DAG_id_type_tag(bmain, GS(id->name));
 }
 
 static void lib_id_recalc_data_tag(Main *bmain, ID *id)
 {
 	id->flag |= LIB_ID_RECALC_DATA;
-	bmain->id_tag_update[id->name[0]] = 1;
+	DAG_id_type_tag(bmain, GS(id->name));
 }
 
 /* node was checked to have lasttime != curtime and is if type ID_OB */
@@ -2818,6 +2818,7 @@ void DAG_ids_check_recalc(Main *bmain, Scene *scene, int time)
 void DAG_ids_clear_recalc(Main *bmain)
 {
 	ListBase *lbarray[MAX_LIBARRAY];
+	bNodeTree *ntree;
 	int a;
 
 	/* loop over all ID types */
@@ -2830,9 +2831,15 @@ void DAG_ids_clear_recalc(Main *bmain)
 		/* we tag based on first ID type character to avoid 
 		 * looping over all ID's in case there are no tags */
 		if (id && bmain->id_tag_update[id->name[0]]) {
-			for (; id; id = id->next)
+			for (; id; id = id->next) {
 				if (id->flag & (LIB_ID_RECALC | LIB_ID_RECALC_DATA))
 					id->flag &= ~(LIB_ID_RECALC | LIB_ID_RECALC_DATA);
+
+				/* some ID's contain semi-datablock nodetree */
+				ntree = ntreeFromID(id);
+				if (ntree && (ntree->id.flag & (LIB_ID_RECALC | LIB_ID_RECALC_DATA)))
+					ntree->id.flag &= ~(LIB_ID_RECALC | LIB_ID_RECALC_DATA);
+			}
 		}
 	}
 
@@ -2899,8 +2906,18 @@ void DAG_id_tag_update(ID *id, short flag)
 	}
 }
 
-void DAG_id_type_tag(struct Main *bmain, short idtype)
+void DAG_id_type_tag(Main *bmain, short idtype)
 {
+	if (idtype == ID_NT) {
+		/* stupid workaround so parent datablocks of nested nodetree get looped
+		 * over when we loop over tagged datablock types */
+		DAG_id_type_tag(bmain, ID_MA);
+		DAG_id_type_tag(bmain, ID_TE);
+		DAG_id_type_tag(bmain, ID_LA);
+		DAG_id_type_tag(bmain, ID_WO);
+		DAG_id_type_tag(bmain, ID_SCE);
+	}
+
 	bmain->id_tag_update[((char *)&idtype)[0]] = 1;
 }
 

source/blender/blenkernel/intern/node.c

@@ -38,9 +38,13 @@
 
 #include "DNA_action_types.h"
 #include "DNA_anim_types.h"
+#include "DNA_lamp_types.h"
+#include "DNA_material_types.h"
 #include "DNA_node_types.h"
 #include "DNA_node_types.h"
 #include "DNA_scene_types.h"
+#include "DNA_texture_types.h"
+#include "DNA_world_types.h"
 
 #include "BLI_string.h"
 #include "BLI_math.h"
@@ -1154,6 +1158,18 @@ void ntreeSetOutput(bNodeTree *ntree)
 	 * might be different for editor or for "real" use... */
 }
 
+bNodeTree *ntreeFromID(ID *id)
+{
+	switch (GS(id->name)) {
+		case ID_MA: return ((Material*)id)->nodetree;
+		case ID_LA: return ((Lamp*)id)->nodetree;
+		case ID_WO: return ((World*)id)->nodetree;
+		case ID_TE: return ((Tex*)id)->nodetree;
+		case ID_SCE: return ((Scene*)id)->nodetree;
+		default: return NULL;
+	}
+}
+
 typedef struct MakeLocalCallData {
 	ID *group_id;
 	ID *new_id;

source/blender/blenloader/intern/readfile.c

@@ -2409,6 +2409,8 @@ static void direct_link_nodetree(FileData *fd, bNodeTree *ntree)
 	ntree->adt = newdataadr(fd, ntree->adt);
 	direct_link_animdata(fd, ntree->adt);
 	
+	ntree->id.flag &= ~(LIB_ID_RECALC|LIB_ID_RECALC_DATA);
+
 	link_list(fd, &ntree->nodes);
 	for (node = ntree->nodes.first; node; node = node->next) {
 		node->typeinfo = NULL;