undo/redo for creating area description rects

src/scenedit/scen.actions.cpp

@@ -918,10 +918,18 @@ static bool handle_terrain_action(location the_point, bool ctrl_hit) {
 						iter->descr = "";
 						if(!edit_area_rect_str(*iter))
 							iter->right = 0;
+						else{
+							undo_list.add(action_ptr(new aCreateAreaRect(iter - area_descs.begin(), *iter)));
+							update_edit_menu();
+						}
 					} else {
 						area_descs.emplace_back(working_rect);
 						if(!edit_area_rect_str(area_descs.back()))
 							area_descs.pop_back();
+						else{
+							undo_list.add(action_ptr(new aCreateAreaRect(area_descs.size() - 1, area_descs.back())));
+							update_edit_menu();
+						}
 					}
 					change_made = true;
 				}

src/scenedit/scen.undo.cpp

@@ -1231,4 +1231,14 @@ bool aEditTownBounds::redo_me() {
 		scenario.towns[area.town_num]->in_town_rect = new_rect;
 	}
 	return true;
+}
+
+bool aCreateAreaRect::undo_me() {
+	area->area_desc[which] = {0, 0, 0, 0, "*"};
+	return true;
+}
+
+bool aCreateAreaRect::redo_me() {
+	area->area_desc[which] = rect;
+	return true;
 }

src/scenedit/scen.undo.hpp

@@ -17,6 +17,7 @@
 
 extern cScenario scenario;
 extern cTown* town;
+extern cArea* get_current_area();
 extern bool editing_town;
 extern short cur_town;
 extern location cur_out;
@@ -829,4 +830,18 @@ public:
 		for_saved_items(saved_items), old_rect(old_rect), new_rect(new_rect) {}
 };
 
+class aCreateAreaRect : public cTerrainAction {
+	size_t which;
+	info_rect_t rect;
+	cArea* area;
+	bool undo_me() override;
+	bool redo_me() override;
+public:
+	aCreateAreaRect(size_t which, info_rect_t rect) :
+		cTerrainAction("Create Area Description", rect.topLeft()),
+		which(which),
+		rect(rect),
+		area(get_current_area()) {}
+};
+
 #endif