gistfile1.txt

                                    if (clickedItem.doMaterialsMatch(cursor) && ItemStack.equals(clickedItem, cursor)) {
                                        int toPlace = packet102windowclick.button == 0 ? clickedItem.count : 1;
                                        toPlace = Math.min(toPlace, clickedItem.count - cursor.count);
                                        toPlace = Math.min(toPlace, clickedItem.getMaxStackSize() - cursor.count);
                                        toPlace = Math.min(toPlace, slot.inventory.getMaxStackSize() - cursor.count);
                                        if (toPlace == 1) {
                                            action = InventoryAction.PLACE_ONE;
                                        } else if (toPlace == cursor.count) {
                                            action = InventoryAction.PLACE_ALL;
                                        } else if (toPlace <= 0) {
                                            action = InventoryAction.NOTHING;
                                        } else {
                                            action = InventoryAction.PLACE_SOME;
                                        }
                                    }