log history memory usage add fix virtual dtor for Action subclasses to be deleted from memory

engine/action.h

@@ -5,6 +5,8 @@ class Action
 public:
     virtual void run() = 0;
     virtual void undo() = 0;
+    virtual size_t memory() = 0;
+    virtual ~Action(){};
 };
 
 class ActionManager
@@ -12,13 +14,22 @@ class ActionManager
 public:
     static ActionManager I;
     std::stack<std::unique_ptr<Action>> m_actions;
+    size_t m_memory = 0;
     static void add(Action* action)
     {
         I.m_actions.emplace(action);
+        I.m_memory += action->memory();
+        LOG("History: %.2f KB", I.m_memory / 1024.f);
     }
     static void undo()
     {
         I.m_actions.top()->undo();
+        I.m_memory -= I.m_actions.top()->memory();
         I.m_actions.pop();
+        LOG("History: %.2f KB", I.m_memory / 1024.f);
+    }
+    static bool empty()
+    {
+        return I.m_actions.empty();
     }
 };