source/blender/blenkernel/intern/node_tree_interface.cc

@@ -1205,7 +1205,7 @@ bNodeTreeInterfaceItem *bNodeTreeInterface::insert_item_copy(const bNodeTreeInte
 
 bool bNodeTreeInterface::remove_item(bNodeTreeInterfaceItem &item, bool move_content_to_parent)
 {
-  bNodeTreeInterfacePanel *parent = this->find_item_parent(item);
+  bNodeTreeInterfacePanel *parent = this->find_item_parent(item, true);
   if (parent == nullptr) {
     return false;
   }

source/blender/makesdna/DNA_node_tree_interface_types.h

@@ -246,7 +246,10 @@ typedef struct bNodeTreeInterface {
     /* const_cast to avoid a const version of #find_parent_recursive. */
     const bNodeTreeInterfacePanel *parent =
         const_cast<bNodeTreeInterfacePanel &>(root_panel).find_parent_recursive(item);
-    BLI_assert(parent != nullptr);
+    if (parent == nullptr || parent == &root_panel) {
+      /* Panel is the root panel. */
+      return 0;
+    }
     return parent->item_position(item);
   }
   /**
@@ -274,11 +277,19 @@ typedef struct bNodeTreeInterface {
   }
   /**
    * Find the panel containing the item.
+   * \param include_root: Allow #root_panel as a return value,
+   *                      otherwise return nullptr for root items.
    * \return Parent panel containing the item.
    */
-  bNodeTreeInterfacePanel *find_item_parent(const bNodeTreeInterfaceItem &item)
+  bNodeTreeInterfacePanel *find_item_parent(const bNodeTreeInterfaceItem &item,
+                                            bool include_root = false)
   {
-    return root_panel.find_parent_recursive(item);
+    bNodeTreeInterfacePanel *parent = root_panel.find_parent_recursive(item);
+    /* Return nullptr instead the root panel. */
+    if (!include_root && parent == &root_panel) {
+      return nullptr;
+    }
+    return parent;
   }
 
   /**

source/blender/makesrna/intern/rna_node_tree_interface.cc

@@ -554,9 +554,6 @@ static bNodeTreeInterfaceItem *rna_NodeTreeInterfaceItems_copy(ID *id,
 {
   /* Copy to same parent as the item. */
   bNodeTreeInterfacePanel *parent = interface->find_item_parent(*item);
-  if (parent == nullptr) {
-    return nullptr;
-  }
   return rna_NodeTreeInterfaceItems_copy_to_parent(id, interface, bmain, reports, item, parent);
 }
 
@@ -850,6 +847,7 @@ static void rna_def_node_interface_item(BlenderRNA *brna)
   RNA_def_property_pointer_funcs(
       prop, "rna_NodeTreeInterfaceItem_parent_get", nullptr, nullptr, nullptr);
   RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_NO_COMPARISON);
   RNA_def_property_ui_text(prop, "Parent", "Panel that contains the item");
 
   prop = RNA_def_property(srna, "position", PROP_INT, PROP_NONE);