fix lambda leaks

file/luajit_context.cc

@@ -77,8 +77,7 @@ class LuaContext::Queue final : public nf7::luajit::Queue,
   ~Queue() noexcept {
     th_->Push(
         std::make_shared<nf7::GenericContext>(*env_, 0, "deleting lua_State"),
-        [L = L](auto) { lua_close(L); }
-      );
+        [L = L](auto) { lua_close(L); });
   }
   Queue(const Queue&) = delete;
   Queue(Queue&&) = delete;

file/node_network.cc

@@ -882,6 +882,7 @@ void Network::PostHandle(const Event& ev) noexcept {
     break;
   case Event::kRemove:
     for (const auto& item : items_) item->Detach();
+    AttachLambda(nullptr);
     break;
   case Event::kUpdate:
     break;

file/node_singleton.cc

@@ -65,8 +65,7 @@ class Singleton final : public nf7::FileBase,
                    nf7::DirItem::kTooltip),
       nf7::GenericConfig(mem_),
       nf7::Node(nf7::Node::kNone),
-      life_(*this), log_(*this), mem_(*this, std::move(d)),
-      shared_la_(std::make_shared<Singleton::SharedLambda>(*this)) {
+      life_(*this), log_(*this), mem_(*this, std::move(d)) {
   }
 
   Singleton(nf7::Deserializer& ar) : Singleton(ar.env()) {
@@ -88,6 +87,7 @@ class Singleton final : public nf7::FileBase,
     return {};
   }
 
+  void PostHandle(const nf7::File::Event&) noexcept override;
   void PostUpdate() noexcept override {
     la_.erase(
         std::remove_if(
@@ -207,6 +207,20 @@ std::shared_ptr<nf7::Node::Lambda> Singleton::CreateLambda(
 }
 
 
+void Singleton::PostHandle(const nf7::File::Event& e) noexcept {
+  switch (e.type) {
+  case nf7::File::Event::kAdd:
+    shared_la_ = std::make_shared<SharedLambda>(*this);
+    return;
+  case nf7::File::Event::kRemove:
+    shared_la_->Abort();
+    shared_la_ = nullptr;
+    return;
+  default:
+    return;
+  }
+}
+
 void Singleton::UpdateMenu() noexcept {
   if (ImGui::MenuItem("drop current lambda")) {
     shared_la_->Abort();