ULTIMA8: Bad render order on barrel at docks

[OMGPizzaGuy]

Version 2.8.0
After Devon becomes Tempest, an additional barrel appears on the docks. This does not appear to render in the correct order. We may need to verify this in the original game. Save game is attached

[OMGPizzaGuy]

Barrel is created with Item::I_legalCreateAtCoords at function 0581:25F0
However the position does not appear to match original game. See latest screenshot.

[OMGPizzaGuy]

Barrel Position:
ScummVM: 11583, 4687, 48
Original: 11615, 4735, 48 (+32, +48, 0)

Barrel Dimensions: 64, 64, 16

[OMGPizzaGuy]

This appears to be attempting to create the barrel in a loop until a valid position is found. Seems we incorrectly mark the position as valid.

[OMGPizzaGuy]

In 548c6e01:

ULTIMA8: Update fast area during item create from usecode.
Fixes invalid placement of barrel #14839

[OMGPizzaGuy]

Reverted previous fix: updating the fast area would cause NPCs to blink in & out to existence when moving in Central Tenebrae. A proper fix might be to expand the fast area rather than updating it completely.

[OMGPizzaGuy]

In 2c5de6e0:

ULTIMA8: Expand fast area during item create from usecode.
The previous attempt to fix would cause NPCs to blink in & out to existence when moving in Central Tenebrae.
Fixes invalid placement of barrel #14839