Commit: 2bd71b49e79325863bfe3c561fa03653231c9914
Author: Jacques Lucke
Date:   Tue Feb 1 17:48:44 2022 +0100
Branches: blender-v3.1-release
https://developer.blender.org/rB2bd71b49e79325863bfe3c561fa03653231c9914

Fix T95395: dangling parent pointer when creating node group

Differential Revision: https://developer.blender.org/D13981

===================================================================

M       source/blender/editors/space_node/node_group.cc

===================================================================

diff --git a/source/blender/editors/space_node/node_group.cc 
b/source/blender/editors/space_node/node_group.cc
index 73e419d667a..3d3f8378916 100644
--- a/source/blender/editors/space_node/node_group.cc
+++ b/source/blender/editors/space_node/node_group.cc
@@ -776,6 +776,18 @@ static void node_group_make_insert_selected(const bContext 
&C, bNodeTree &ntree,
 
   ListBase anim_basepaths = {nullptr, nullptr};
 
+  /* Detach unselected nodes inside frames when the frame is put into the 
group. Otherwise the
+   * `parent` pointer becomes dangling. */
+  LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
+    if (node->parent == nullptr) {
+      continue;
+    }
+    if (node_group_make_use_node(*node->parent, gnode) &&
+        !node_group_make_use_node(*node, gnode)) {
+      nodeDetachNode(node);
+    }
+  }
+
   /* move nodes over */
   LISTBASE_FOREACH_MUTABLE (bNode *, node, &ntree.nodes) {
     if (node_group_make_use_node(*node, gnode)) {

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