Fix T87360 Multi input links aren't placed correctly when created with python

link->multi_input_socket_index, which is used to calculate the links
position on the multi-input socket, was not set.
Now it is set to the sockets current link count.

Review: Jacques Lucke (JacquesLucke)
Differential Revision: https://developer.blender.org/D11082

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/node.cc b/source/blender/blenkernel/intern/node.cc
index 02195e0d60f..cf5f7163c17 100644
--- a/source/blender/blenkernel/intern/node.cc
+++ b/source/blender/blenkernel/intern/node.cc
@@ -2172,6 +2172,17 @@ bNodeTree *ntreeCopyTree_ex_new_pointers(const bNodeTree *ntree,
   return new_ntree;
 }
 
+static int node_count_links(const bNodeTree *ntree, const bNodeSocket *socket)
+{
+  int count = 0;
+  LISTBASE_FOREACH (bNodeLink *, link, &ntree->links) {
+    if (ELEM(socket, link->fromsock, link->tosock)) {
+      count++;
+    }
+  }
+  return count;
+}
+
 /* also used via rna api, so we check for proper input output direction */
 bNodeLink *nodeAddLink(
     bNodeTree *ntree, bNode *fromnode, bNodeSocket *fromsock, bNode *tonode, bNodeSocket *tosock)
@@ -2208,6 +2219,10 @@ bNodeLink *nodeAddLink(
     ntree->update |= NTREE_UPDATE_LINKS;
   }
 
+  if(link->tosock->flag & SOCK_MULTI_INPUT){
+    link->multi_input_socket_index = node_count_links(ntree,link->tosock) - 1;
+  }
+
   return link;
 }