source/blender/blenkernel/BKE_blender_version.h

@@ -29,7 +29,7 @@ extern "C" {
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION
-#define BLENDER_FILE_SUBVERSION 28
+#define BLENDER_FILE_SUBVERSION 29
 
 /* Minimum Blender version that supports reading file written with the current
  * version. Older Blender versions will test this and cancel loading the file, showing a warning to

source/blender/blenloader/intern/versioning_400.cc

@@ -1546,6 +1546,19 @@ void blo_do_versions_400(FileData *fd, Library * /*lib*/, Main *bmain)
     }
   }
 
+  if (!MAIN_VERSION_FILE_ATLEAST(bmain, 400, 29)) {
+    /* Unhide all Reroute nodes. */
+    FOREACH_NODETREE_BEGIN (bmain, ntree, id) {
+      LISTBASE_FOREACH (bNode *, node, &ntree->nodes) {
+        if (node->is_reroute()) {
+          static_cast<bNodeSocket *>(node->inputs.first)->flag &= ~SOCK_HIDDEN;
+          static_cast<bNodeSocket *>(node->outputs.first)->flag &= ~SOCK_HIDDEN;
+        }
+      }
+    }
+    FOREACH_NODETREE_END;
+  }
+
   /**
    * Versioning code until next subversion bump goes here.
    *

source/blender/editors/space_node/node_edit.cc

@@ -1102,6 +1102,11 @@ bool node_has_hidden_sockets(bNode *node)
 
 void node_set_hidden_sockets(bNode *node, int set)
 {
+  /* The Reroute node is the socket itself, do not hide this. */
+  if (node->is_reroute()) {
+    return;
+  }
+
   if (set == 0) {
     LISTBASE_FOREACH (bNodeSocket *, sock, &node->inputs) {
       sock->flag &= ~SOCK_HIDDEN;

source/blender/makesrna/intern/rna_node_socket.cc

@@ -293,6 +293,15 @@ static void rna_NodeSocket_hide_set(PointerRNA *ptr, bool value)
     return;
   }
 
+  bNodeTree *ntree = reinterpret_cast<bNodeTree *>(ptr->owner_id);
+  bNode *node;
+  nodeFindNode(ntree, sock, &node, nullptr);
+
+  /* The Reroute node is the socket itself, do not hide this. */
+  if (node->is_reroute()) {
+    return;
+  }
+
   if (value) {
     sock->flag |= SOCK_HIDDEN;
   }