Fix T66378: Missing animation update when switching view layer

Current frame is stored in a scene, and scene might have multiple view
layers. The inactive view layers were not informed about scene's frame
being changed, so when user switched back to view after changing scene
frame it was in an inconsistent state between current scene frame and
animation.

Now we tag scene for time changes, so dependency graph can catch up
and do proper update.

Currently tagging is from quite generic place. Probably better approach
would be to tag from where frame is actually being assigned. Downside
of this is that it's easy to miss some places.

Reviewers: brecht, mont29

Reviewed By: brecht

Maniphest Tasks: T66378

Differential Revision: https://developer.blender.org/D5332

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph.h b/source/blender/depsgraph/intern/depsgraph.h
index f194a44346b..507d2d9ec08 100644
--- a/source/blender/depsgraph/intern/depsgraph.h
+++ b/source/blender/depsgraph/intern/depsgraph.h
@@ -160,6 +160,10 @@ struct Depsgraph {
   /* Nodes which have been tagged as "directly modified". */
   GSet *entry_tags;
 
+  /* Special entry tag for time source. Allows to tag invisible dependency graphs for update when
+   * scene frame changes, so then when dependency graph becomes visible it is on a proper state. */
+  bool need_update_time;
+
   /* Convenience Data ................... */
 
   /* XXX: should be collected after building (if actually needed?) */