Bugfix #5038

The "Copy Size" constraint was calling a where_is_object(), this caused
the depsgraph to mess up in very weird ways and rare occasions. In the
sample file it showed strange lags in bones for using the "Stride bone"
option.

While trying to locate the bug I've revisited the Pose depsgraph in detail,
trying to figure out how it can print possible cycle errors in dependency.
That has been added now too (in console). Unfortunately the bugreport
example had no cycle errors. :)

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/blenkernel/depsgraph_private.h b/source/blender/blenkernel/depsgraph_private.h
index 527b78bcbe3..15c06b8ae79 100644
--- a/source/blender/blenkernel/depsgraph_private.h
+++ b/source/blender/blenkernel/depsgraph_private.h
@@ -73,6 +73,7 @@ typedef struct DagNode
 	int DFS_dvtm;		// DFS discovery time
 	int DFS_fntm;		// DFS Finishing time
 	struct DagAdjList *child;
+	struct DagAdjList *parent;
 	struct DagNode *next;
 } DagNode;