Sophisticated Backpacks InventoryWeight

Accurate MT Inventory Weight support for Sophisticated Backpacks (Unofficial Fabric port).

MT Inventory Weight ships a generic backpack calculator that reads container NBT, but Sophisticated Backpacks assigns each backpack a UUID and stores its real contents in world BackpackStorage (PersistentState) — not always in the item NBT. Generic NBT reading therefore under- or mis-counts SB backpacks. This add-on fixes that by reading the actual contents through the Sophisticated Backpacks API.

It registers an Inventory Weight item weight provider (via the inventoryweight entrypoint) at priority 8500 — above the built-in generic backpacks provider (8000) — so SB backpacks are handled by this accurate provider while everything else falls through to the defaults.

To read contents it uses the SB wrapper API. This resolves UUID-backed contents from BackpackStorage automatically, so equipped, held, and stored backpacks are all weighed correctly.

Weight model

Matches the built-in backpack model:

effectiveWeight = emptyBackpackWeight + (contentsWeight / 2)

• contentsWeight is computed by recursing each inner stack through Inventory Weight's own lookup (context.nested()), so datapack weights, nested containers, and other add-ons all apply.
• The result's base weight carries the full (undivided) contents weight for display.

Notes

• If Sophisticated Backpacks is not installed, the provider is inactive (a warning is logged) and Inventory Weight uses its default behavior.
• nested() is used when recursing to avoid runaway depth with nested backpacks.
• The empty-backpack base weight is a single constant (SophisticatedBackpacksInventoryWeight#EMPTY_BACKPACK_WEIGHT); wire it to fzzy_config if you want it user-configurable.