Fix T69573: Driver Value does not slide along the actual value in the Driver Editor

This change is two-fold:

- Ensure the result of the F-Curve evaluation is stored on the FCurve
  object. This was done in 2.79 but lost when we moved to more granular
  per-curve evaluation from the depsgraph.
- Flush this result from the CoW copy back to the original.

Reviewed by: sergey

Differential Revision: https://developer.blender.org/D5888

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_animsys.h b/source/blender/blenkernel/BKE_animsys.h
index a2a14011595..7ef99fe1405 100644
--- a/source/blender/blenkernel/BKE_animsys.h
+++ b/source/blender/blenkernel/BKE_animsys.h
@@ -289,7 +289,7 @@ void BKE_animsys_eval_animdata(struct Depsgraph *depsgraph, struct ID *id);
 void BKE_animsys_eval_driver(struct Depsgraph *depsgraph,
                              struct ID *id,
                              int driver_index,
-                             struct ChannelDriver *driver_orig);
+                             struct FCurve *fcu_orig);
 
 void BKE_animsys_update_driver_array(struct ID *id);