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Fix crash on node duplication

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That happened when an instanced scene was being duplicated while it also contained nodes added to it in the scene holding the instance.

Plus:
- Add comments about the logic behind all this.
- Move the null guard to where it can protect the most, but consider it a runtime error rather that a situation we expect.

Fixes #13282.
This commit is contained in:
Pedro J. Estébanez 2017-11-25 21:13:52 +01:00
parent 9738ebcda0
commit 922cf9fbb0
1 changed files with 9 additions and 3 deletions
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12
scene/main/node.cpp
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@ -2114,8 +2114,16 @@ Node *Node::_duplicate(int p_flags, Map<const Node *, Node *> *r_duplimap) const
node_tree.push_front(this);
if (instanced) {
// Since nodes in the instanced hierarchy won't be duplicated explicitly, we need to make an inventory
// of all the nodes in the tree of the instanced scene in order to transfer the values of the properties
for (List<const Node *>::Element *N = node_tree.front(); N; N = N->next()) {
for (int i = 0; i < N->get()->get_child_count(); ++i) {
// Skip nodes not really belonging to the instanced hierarchy; they'll be processed normally later
if (get_child(i)->data.owner != this)
continue;
node_tree.push_back(N->get()->get_child(i));
}
}
@ -2124,6 +2132,7 @@ Node *Node::_duplicate(int p_flags, Map<const Node *, Node *> *r_duplimap) const
for (List<const Node *>::Element *N = node_tree.front(); N; N = N->next()) {
Node *current_node = node->get_node(get_path_to(N->get()));
ERR_CONTINUE(!current_node);
if (p_flags & DUPLICATE_SCRIPTS) {
bool is_valid = false;
@ -2136,9 +2145,6 @@ Node *Node::_duplicate(int p_flags, Map<const Node *, Node *> *r_duplimap) const
List<PropertyInfo> plist;
N->get()->get_property_list(&plist);
if (!current_node)
continue;
for (List<PropertyInfo>::Element *E = plist.front(); E; E = E->next()) {
if (!(E->get().usage & PROPERTY_USAGE_STORAGE))