Fix metadata loss and. Improve placement for some corner cases.

match_craft.lua

@@ -317,6 +317,8 @@ can be one of the source lists.
 If destination list position is already occupied with some other item
 then function tries to move it to the source lists if possible.
 
+Warning!!! Moving oversized stacks is undefined and can lead to item loss!
+
 Arguments:
 	inv: minetest inventory reference
 	src_lists: names of source lists
@@ -328,44 +330,48 @@ function unified_inventory.move_match(inv, src_lists, dst_list, match_table, amo
 	local moved_positions = {}
 
 	for item, pos_set in pairs(match_table) do
-		local stack_max = ItemStack(item):get_stack_max()
+		local needed = {}
+		local remained = {}
+
+		local stack = ItemStack(item)
+		local stack_max = stack:get_stack_max()
 		local bounded_amount = math.min(stack_max, amount)
-		local pos_count = 0;
 
-		for _ in pairs(pos_set) do
+		-- Pass 1: Remove stacks needed for craft
-			pos_count = pos_count + 1
+		stack:set_count(bounded_amount)
-		end
-
-		local total = ItemStack{
-			name = item,
-			count = bounded_amount * pos_count
-		}
-
-		local removed = unified_inventory.remove_item(inv, src_lists, total)
-		local current = ItemStack(removed)
-		current:set_count(bounded_amount)
 
 		for pos in pairs(pos_set) do
+			needed[pos] = unified_inventory.remove_item(inv, src_lists, stack)
+		end
+
+		-- Pass 2: Remove remainder to free up positions
+		stack:set_count(stack_max)
+
+		for pos in pairs(pos_set) do
+			remained[pos] = unified_inventory.remove_item(inv, src_lists, stack)
+		end
+
+		-- Pass 3: Move only needed stacks
+		for pos, current in pairs(needed) do
 			local occupied = inv:get_stack(dst_list, pos)
 			inv:set_stack(dst_list, pos, current)
 
-			repeat
+			if not occupied:is_empty() then
-				if not occupied:is_empty() then
+				local leftover = unified_inventory.add_item(inv, src_lists, occupied)
-					local leftover = unified_inventory.add_item(inv, src_lists, occupied)
 
-					if not leftover:is_empty() then
+				if not leftover:is_empty() then
-						inv:set_stack(dst_list, pos, leftover)
+					inv:set_stack(dst_list, pos, leftover)
-						break
+					unified_inventory.add_item(inv, src_lists, current)
-					end
 				end
-
+			end
-				removed:take_item(bounded_amount)
-			until true
 
 			moved_positions[pos] = true
 		end
 
-		unified_inventory.add_item(inv, src_lists, removed)
+		-- Pass 4: Re-add remainder stacks
+		for _, current in pairs(remained) do
+			unified_inventory.add_item(inv, src_lists, current)
+		end
 	end
 
 	unified_inventory.swap_items(inv, dst_list, src_lists, moved_positions)