my shop after buying one stack of cobblestone: what I want the shop to do when someone buys a stack of cobblestone: Selling items to chestshops shouldn't change. They should still use the normal ordering.
But how does this benefit you? Your screenshots simply show the stack that's been bought is taken from the end of a chest stock rather than the start of the chest stocks, but other than that there's literally no point to this suggestion?
Maybe for you, I don't see the need for this to be updated. Having a buy or sell chest take stocks from opposite ends doesn't make sense, if anything just over complicates it all. I'll vote neutral because I personally don't need this, tho I do see the very small qol improvement this could offer for you.
If this is on eco I don't really mind what happens. I will say though that some redstone systems will fail if this was changed. I can explain why in short I won't go into detail; but in essence droppers check the first empty slot to insert not the last, and if there are two empty slots which is the case in some systems, they would then break with what I consider a useless update. No offense.
Except that, you haven't explained how you think its objectively better.. lol. And with what grep says, I have to agree with them. Using shop chests with redstone, comparators, droppers, and hoppers, it would then break seeing as all these use the first item slot. Maybe you can download a qol datapack/client mod that sorts them in reverse for you. That could work better.
datapacks are serverside and client mods can't sort chests which I'm not looking at. Can you post an example setup which would break? I have a hard time visualising what you and grep are trying to convey when you say it will break some redstone.
So you want it that when people buy from your chest it takes from the end not the start right, well every casino buy chestshop uses comparators. And droppers to sell the casino tickets via the first slot. If the itmes are being bought from the Last, not the First, then these casino ticket chests won't work. Because the comparator won't detect the changes of the first slot. Likewise with hoppers. They take from the first slot. So if you have a chest setup with hoppers that also wouldn't work. That's an example I can think of
I am retiring, so I will not give you an example that is super clear because you don't need it. I don't think your need to have 'order' is going to trump what has and will exist on basic minecraft redstone mechanics since like 2013.
I love your spunk ab, but you are slightly mistaken. It has less to do with comparators and more to do with the fact droppers drop into the first empty slot, not the second or the third, so if there are two available slots it normally would drop into the first empty slot, which is fine because that's also the first slot to empty. If it was changed it would no longer be the first slot emptied but it would be the last slot drained, hence if there was another slot before that last empty slot it'd insert into that slot and not the one just emptied essentially going somewhere you don't want that item. Actually it'd create more fuddled inventory problems.