Depsgraph: Introduce flag top indicate scene is evaluating for a new frame

source/blender/depsgraph/intern/nodes/deg_node_time.cc

@@ -33,10 +33,13 @@
 #include "intern/depsgraph_intern.h"
 #include "util/deg_util_foreach.h"
 
+#include "DNA_scene_types.h"
+
 namespace DEG {
 
 void TimeSourceDepsNode::tag_update(Depsgraph *graph)
 {
+	graph->scene_cow->id.recalc |= ID_RECALC_TIME;
 	foreach (DepsRelation *rel, outlinks) {
 		DepsNode *node = rel->to;
 		node->tag_update(graph);

source/blender/makesdna/DNA_ID.h

@@ -483,6 +483,7 @@ enum {
 	ID_RECALC_TRANSFORM   = 1 << 5,
 	ID_RECALC_COLLECTIONS = 1 << 6,
 	ID_RECALC_COPY_ON_WRITE = 1 << 7,
+	ID_RECALC_TIME          = 1 << 8,
 	/* Special flag to check if SOMETHING was changed. */
 	ID_RECALC_ALL   = (~(int)0),
 };