[1.8.9] Item Merge editing?

[Atijaf]

I'm wanting to control which items merge based on an additional requirement.

 

When two pieces of stone are dropped, they merge into 1 when they come close to each other.  Is there an event for this?

 

Thanks!

[Atijaf]

It's for every item/block

[Atijaf]

The additional requirement is whether or not the item that is on the ground has been modified, by the player, in any way - If the block was placed by the player and then broken, or if the player drops the block it'll have a NBTTag storing a boolean.  A method for getting that information #isCollectable(ItemStack)

 

I've made a skill that depends on blocks that are naturally generated by the world and when the player collects said blocks.

 

But, the merging thing was just an extra step towards making this a little bit more friendly.  For instance, if one block of stone is collectible, and another block of stone is not collectible, and they merge, the two of them become non collectible and won't count towards the skill.

[Draco18s]

...You realize that when that block gets placed that NBT information is lost...right?

[Atijaf]

Yes.  I've worked on a different solution for that.

[Draco18s]

I think I have now realized your issue:

 

ItemStacks aren't combining at all (because of your NBT) and you want to force them to combine (rather than, as I initially thought, preventing them from combining).  That's tricky, as there are multiple places where this needs to occur, not just at the EntityItemStack level.