Rather than having a FromFolderID property on every single prim and only ever using the root prim one, store on SOG instead.

This reduces pointless memory usage.

OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs

@@ -4271,7 +4271,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 block.OwnerID = sop.OwnerID;
 
             block.ItemID = sop.FromUserInventoryItemID;
-            block.FolderID = UUID.Zero; // sop.FromFolderID ??
+            block.FolderID = UUID.Zero; // sog.FromFolderID ??
             block.FromTaskID = UUID.Zero; // ???
             block.InventorySerial = (short)sop.InventorySerial;
             

OpenSim/Region/CoreModules/Framework/InventoryAccess/InventoryAccessModule.cs

@@ -654,9 +654,9 @@ namespace OpenSim.Region.CoreModules.Framework.InventoryAccess
                 //
                 if (action == DeRezAction.Take || action == DeRezAction.TakeCopy)
                 {
-                    if (so.RootPart.FromFolderID != UUID.Zero && userID == remoteClient.AgentId)
+                    if (so.FromFolderID != UUID.Zero && userID == remoteClient.AgentId)
                     {
-                        InventoryFolderBase f = new InventoryFolderBase(so.RootPart.FromFolderID, userID);
+                        InventoryFolderBase f = new InventoryFolderBase(so.FromFolderID, userID);
                         folder = m_Scene.InventoryService.GetFolder(f);
                     }
                 }
@@ -962,7 +962,7 @@ namespace OpenSim.Region.CoreModules.Framework.InventoryAccess
                     rootPart.SalePrice = item.SalePrice;
                 }
 
-                rootPart.FromFolderID = item.Folder;
+                so.FromFolderID = item.Folder;
 
 //                Console.WriteLine("rootPart.OwnedID {0}, item.Owner {1}, item.CurrentPermissions {2:X}",
 //                                  rootPart.OwnerID, item.Owner, item.CurrentPermissions);

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -586,10 +586,21 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
-       /// <summary>
+        /// <summary>
-       /// The item ID that this object was rezzed from, if applicable.
+        /// The item ID that this object was rezzed from, if applicable.
-       /// </summary>
+        /// </summary>
-       public UUID FromItemID { get; set; }
+        /// <remarks>
+        /// If not applicable will be UUID.Zero
+        /// </remarks>
+        public UUID FromItemID { get; set; }
+
+        /// <summary>
+        /// The folder ID that this object was rezzed from, if applicable.
+        /// </summary>
+        /// <remarks>
+        /// If not applicable will be UUID.Zero
+        /// </remarks>
+        public UUID FromFolderID { get; set; }
 
         #endregion
 

OpenSim/Region/Framework/Scenes/SceneObjectPart.cs

@@ -182,8 +182,6 @@ namespace OpenSim.Region.Framework.Scenes
 
         public uint TimeStampTerse;
 
-        public UUID FromFolderID;
-
         public int STATUS_ROTATE_X;
 
         public int STATUS_ROTATE_Y;