undo/redo for edit talk node

src/scenedit/scen.actions.cpp

@@ -543,7 +543,8 @@ static bool handle_rb_action(location the_point, bool option_hit) {
 							is_new = true;
 							town->talking.talk_nodes.emplace_back();
 						}
-						if((j = edit_talk_node(j)) >= 0){
+						cSpeech::cNode old_node = town->talking.talk_nodes[j];
+						if(edit_talk_node(j) >= 0){
 							// Cancel create new
 							if(is_new)
 								town->talking.talk_nodes.erase(town->talking.talk_nodes.begin() + j);
@@ -554,8 +555,9 @@ static bool handle_rb_action(location the_point, bool option_hit) {
 							update_edit_menu();
 						}
 						// Edit confirmed
-						else{
-
+						else if(old_node != town->talking.talk_nodes[j]){
+							undo_list.add(action_ptr(new aEditTalkNode(cur_town, j, old_node, town->talking.talk_nodes[j])));
+							update_edit_menu();
 						}
 					}
 					start_dialogue_editing();

src/scenedit/scen.undo.cpp

@@ -1024,4 +1024,14 @@ bool aCreateDeleteTalkNode::redo_me() {
 	// Show the change
 	start_dialogue_editing();
 	return true;
+}
+
+bool aEditTalkNode::undo_me() {
+	scenario.towns[town_num]->talking.talk_nodes[which] = old_node;
+	return true;
+}
+
+bool aEditTalkNode::redo_me() {
+	scenario.towns[town_num]->talking.talk_nodes[which] = new_node;
+	return true;
 }

src/scenedit/scen.undo.hpp

@@ -685,4 +685,16 @@ public:
 		cAction(create ? "Create Talk Node" : "Delete Talk Node", !create), town_num(town_num), which(which), node(node) {}
 };
 
+class aEditTalkNode : public cAction {
+	size_t town_num;
+	size_t which;
+	cSpeech::cNode old_node;
+	cSpeech::cNode new_node;
+	bool undo_me() override;
+	bool redo_me() override;
+public:
+	aEditTalkNode(size_t town_num, size_t which, cSpeech::cNode old_node, cSpeech::cNode new_node) :
+		cAction("Edit Talk Node"), town_num(town_num), which(which), old_node(old_node), new_node(new_node) {}
+};
+
 #endif