undo/redo edit placed item

src/scenario/town.cpp

@@ -276,4 +276,15 @@ bool cTown::any_preset_items() const {
 		if(item.code >= 0) return true;
 	}
 	return false;
+}
+
+bool cTown::cItem::operator==(const cTown::cItem& other) {
+	CHECK_EQ(other, loc);
+	CHECK_EQ(other, code);
+	CHECK_EQ(other, ability);
+	CHECK_EQ(other, charges);
+	CHECK_EQ(other, always_there);
+	CHECK_EQ(other, property);
+	CHECK_EQ(other, contained);
+	return true;
 }

src/scenario/town.hpp

@@ -59,6 +59,9 @@ public:
 		eEnchant ability;
 		int charges = -1;
 		bool always_there = false, property = false, contained = false;
+		// For detecting actual changes to town items in the editor
+		bool operator==(const cItem& other);
+		bool operator!=(const cItem& other) { return !(*this == other); }
 		
 		void import_legacy(legacy::preset_item_type old);
 		cItem();