This controls how many undo steps the simulator will store for each prim.
Default is now 20 rather than 5 as it briefly was.
The default number could be increased through this is a memory tradeoff which will scale with the number of prims in the sim and level of activity.
This was present in the code but not enforced, which led to a memory leak over time as part properties were changed, whether by viewer, script or another source.
This commit enforces that limit, which will soon become configurable.
Regression test for undo limit added
Should help with http://opensimulator.org/mantis/view.php?id=6279
This was accidentally introduced in 4fc0cfb
This commit also consistently removes the AssetXferUploader when the transaction completes, no matter if it completed on asset upload or item operation.
The amount of data being retained was small, since this was clothing/bodypart metadata in the asset rather than textures themselves.
This was only used if none of new item, update item or update task item had been set.
But since all transactions go through these paths this old code is redundant.
This was preventing the previous race condition fix in 4fc0cfb from actually working.
This commit also removes some of the pointless transaction id checks - these conditions are already being enforced in AgentAssetsTransactions.
This is done for consistency and to allow removal or some access methods that increase code complexity.
However, this path has not been used for a long time, not even by LL 1.23 - viewers use caps http upload for this instead
On creating these items, the viewer sends a UDP AssetUploadRequest followed by a CreateInventoryItem.
It was possible for the CreateInventoryItem/UpdateInventoryItem to occasionally outrace the AssetUploadRequest and fail to find an initialized Xfer object, at which point the item create would fail.
So instead we always set up a Xfer object on either the asset or inventory item update request.
This does not introduce a new race because code already exists to delay the item operation until the asset is uploaded if necessary (but this only worked if the xfer object already existed)
As far as I know, this was only used by the IBM Rest modules, much of which has been commented out for a very long time now. Other similar code uses HTTP or stream handlers instead.
So commenting this out to reduce code complexity and the need to make this facility consistent with the others where it may not be used anyway.
If this facility is actually being used then please notify me or uncomment it if you are core.
Justin Clark-Casey (justincc)