Fix inventory replace bug

src/inventory.cpp

@@ -818,7 +818,7 @@ void InventoryList::moveItemSomewhere(u32 i, InventoryList *dest, u32 count)
 }
 
 u32 InventoryList::moveItem(u32 i, InventoryList *dest, u32 dest_i,
-		u32 count, bool swap_if_needed)
+		u32 count, bool swap_if_needed, bool *did_swap)
 {
 	if(this == dest && i == dest_i)
 		return count;
@@ -850,6 +850,10 @@ u32 InventoryList::moveItem(u32 i, InventoryList *dest, u32 dest_i,
 		// If olditem is returned, nothing was added.
 		// Swap the items
 		if (nothing_added && swap_if_needed) {
+			// Tell that we swapped
+			if (did_swap != NULL) {
+				*did_swap = true;
+			}
 			// Take item from source list
 			item1 = changeItem(i, ItemStack());
 			// Adding was not possible, swap the items.

src/inventory.h

@@ -246,7 +246,7 @@ public:
 	// count is the maximum number of items to move (0 for everything)
 	// returns number of moved items
 	u32 moveItem(u32 i, InventoryList *dest, u32 dest_i,
-		u32 count = 0, bool swap_if_needed = true);
+		u32 count = 0, bool swap_if_needed = true, bool *did_swap = NULL);
 
 	// like moveItem, but without a fixed destination index
 	// also with optional rollback recording

src/inventorymanager.cpp

@@ -375,8 +375,9 @@ void IMoveAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
 		If something is wrong (source item is empty, destination is the
 		same as source), nothing happens
 	*/
+	bool did_swap = false;
 	move_count = list_from->moveItem(from_i,
-		list_to, to_i, count, !caused_by_move_somewhere);
+		list_to, to_i, count, !caused_by_move_somewhere, &did_swap);
 
 	// If source is infinite, reset it's stack
 	if (src_can_take_count == -1) {
@@ -397,7 +398,7 @@ void IMoveAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
 				}
 			}
 		}
-		if (move_count > 0) {
+		if (move_count > 0 || did_swap) {
 			list_from->deleteItem(from_i);
 			list_from->addItem(from_i, from_stack_was);
 		}