Single-round stacks of ammo deplete all ammo of same type in inventory on shot

[randallarms]

GunSmith v0.5 bug
All stacks of a particular type of ammunition is removed from the inventory when the first found stack of that type is a single-item stack.

[randallarms]

This bug is caused by lines 177-181 in GSListener.java:

if (item.getAmount() > 1) {
item.setAmount(item.getAmount() - 1);
} else {
inv.remove(item);
}

The problem is that setAmount() does not seem to be able to decrease the amount below 1, as that would be removing the item. Therefore, when getAmount() (the amount of items in the stack) is exactly 1, I simply tried remove(item).

Unfortunately, remove() seems to remove all items in the inventory matching the parameter. An ideal fix for this would be to generate a more comprehensive if/else statement to modify the one at lines 177-181.