Favour pre-existing stacks

[SilverTemper]

Issue type:

• ➕ Feature request

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Short description:

Items should favour merging with pre-existing stacks when being inserted into a storage interface. As it stands, it can just get dumped into an empty slot, which radically hampers its use for managing storage.

[rubensworks]

Thanks for the suggestion!

[rubensworks]

Using filtered item interfaces, you can already partially solve this.