remove num_actions

src/tools/undo.cpp

@@ -87,10 +87,8 @@ void cUndoList::add(action_ptr what){
 	UNDO_LOG("Performing " + what->getActionName());
 	theList.erase(theList.begin(), cur);
 	theList.push_front(what);
-	num_actions++;
-	while(num_actions > maxUndoSize) {
+	while(theList.size() > maxUndoSize) {
 		theList.pop_back();
-		num_actions--;
 	}
 	cur = theList.begin();
 }

src/tools/undo.hpp

@@ -56,7 +56,6 @@ using action_ptr = std::shared_ptr<cAction>;
 class cUndoList {
 	std::list<action_ptr> theList;
 	std::list<action_ptr>::iterator cur, lastSave;
-	size_t num_actions = 0;
 public:
 	/// Construct a new undo list.
 	cUndoList();