Add MaxPrimsUndo config setting to [Startup] section of OpenSim.ini.

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.

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -742,6 +742,8 @@ namespace OpenSim.Region.Framework.Scenes
                 //Animation states
                 m_useFlySlow = startupConfig.GetBoolean("enableflyslow", false);
 
+                MaxUndoCount = startupConfig.GetInt("MaxPrimUndos", 20);
+
                 PhysicalPrims = startupConfig.GetBoolean("physical_prim", PhysicalPrims);
                 CollidablePrims = startupConfig.GetBoolean("collidable_prim", CollidablePrims);
 
@@ -932,9 +934,6 @@ namespace OpenSim.Region.Framework.Scenes
             WestBorders.Add(westBorder);
             BordersLocked = false;
 
-            // TODO: At some point this should be made configurable.
-            MaxUndoCount = 5;
-
             m_eventManager = new EventManager();
 
             m_permissions = new ScenePermissions(this);

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -1119,14 +1119,6 @@ namespace OpenSim.Region.Framework.Scenes
                 parts[i].UUID = UUID.Random();
         }
 
-        // helper provided for parts.
-        public int GetSceneMaxUndo()
-        {
-            if (m_scene != null)
-                return m_scene.MaxUndoCount;
-            return 5;
-        }
-
         // justincc: I don't believe this hack is needed any longer, especially since the physics
         // parts of set AbsolutePosition were already commented out.  By changing HasGroupChanged to false
         // this method was preventing proper reload of scene objects.

OpenSim/Region/Framework/Scenes/SceneObjectPart.cs

@@ -3209,13 +3209,13 @@ namespace OpenSim.Region.Framework.Scenes
 //                                    "[SCENE OBJECT PART]: Storing undo state for {0} {1}, forGroup {2}, initial stack size {3}",
 //                                    Name, LocalId, forGroup, m_undo.Count);
 
-                if (ParentGroup.GetSceneMaxUndo() > 0)
+                if (ParentGroup.Scene.MaxUndoCount > 0)
                 {
                     UndoState nUndo = new UndoState(this, forGroup);
 
                     m_undo.Add(nUndo);
 
-                    if (m_undo.Count > ParentGroup.GetSceneMaxUndo())
+                    if (m_undo.Count > ParentGroup.Scene.MaxUndoCount)
                         m_undo.RemoveAt(0);
 
                     if (m_redo.Count > 0)
@@ -3255,7 +3255,7 @@ namespace OpenSim.Region.Framework.Scenes
 
                     UndoState nUndo = null;
     
-                    if (ParentGroup.GetSceneMaxUndo() > 0)
+                    if (ParentGroup.Scene.MaxUndoCount > 0)
                     {
                         nUndo = new UndoState(this, goback.ForGroup);
                     }
@@ -3266,7 +3266,7 @@ namespace OpenSim.Region.Framework.Scenes
                     {
                         m_redo.Add(nUndo);
 
-                        if (m_redo.Count > ParentGroup.GetSceneMaxUndo())
+                        if (m_redo.Count > ParentGroup.Scene.MaxUndoCount)
                             m_redo.RemoveAt(0);
                     }
                 }
@@ -3290,13 +3290,13 @@ namespace OpenSim.Region.Framework.Scenes
                     UndoState gofwd = m_redo[m_redo.Count - 1];
                     m_redo.RemoveAt(m_redo.Count - 1);
 
-                    if (ParentGroup.GetSceneMaxUndo() > 0)
+                    if (ParentGroup.Scene.MaxUndoCount > 0)
                     {
                         UndoState nUndo = new UndoState(this, gofwd.ForGroup);
 
                         m_undo.Add(nUndo);
 
-                        if (m_undo.Count > ParentGroup.GetSceneMaxUndo())
+                        if (m_undo.Count > ParentGroup.Scene.MaxUndoCount)
                             m_undo.RemoveAt(0);
                     }
 

OpenSim/Region/Framework/Scenes/Tests/SceneObjectResizeTests.cs

@@ -62,8 +62,6 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             Assert.That(g1Post.RootPart.Scale.X, Is.EqualTo(2));
             Assert.That(g1Post.RootPart.Scale.Y, Is.EqualTo(3));
             Assert.That(g1Post.RootPart.Scale.Z, Is.EqualTo(4));
-
-            Assert.That(g1Post.RootPart.UndoCount, Is.EqualTo(1));
         }
 
         /// <summary>

OpenSim/Region/Framework/Scenes/Tests/SceneObjectUndoRedoTests.cs

@@ -52,6 +52,7 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             Vector3 secondSize = new Vector3(5, 6, 7);
 
             Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
             SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
 
             // TODO: It happens to be the case that we are not storing undo states for SOPs which are not yet in a SOG,
@@ -113,6 +114,7 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             Vector3 fourthSize = new Vector3(11, 12, 13);
 
             Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
             SceneObjectGroup g1 = SceneHelpers.CreateSceneObject(1, TestHelpers.ParseTail(0x1));
 
             g1.GroupResize(firstSize);
@@ -133,6 +135,7 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             Vector3 newSize = new Vector3(2, 3, 4);
 
             Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
             SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
             Vector3 originalSize = g1.GroupScale;
 
@@ -160,6 +163,7 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             Vector3 newSize = new Vector3(2, 3, 4);
 
             Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
             SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
             Vector3 originalSize = g1.GroupScale;
 

bin/OpenSim.ini.example

@@ -97,6 +97,10 @@
     ;; from the selected region_info_source.
     ; allow_regionless = false
 
+    ;# {MaxPrimUndos} {} {Maximum number of undos avialable for position, rotation and scale changes of each prim} {} 20
+    ;; Increasing the number of undos available number will increase memory usage.
+    MaxPrimUndos = 20
+
     ;# {NonPhysicalPrimMin} {} {Minimum size of nonphysical prims?} {} 0.001
     ;; Minimum size for non-physical prims.  Affects resizing of existing 
     ;; prims.  This can be overriden in the region config file (as 

bin/OpenSimDefaults.ini

@@ -85,6 +85,10 @@
     ;; from the selected region_info_source.
     allow_regionless = false
 
+    ; Maximum number of position, rotation and scale changes for each prim that the simulator will store for later undos
+    ; Increasing this number will increase memory usage.
+    MaxPrimUndos = 20
+
     ; Maximum size of non physical prims.  Affects resizing of existing prims.  This can be overriden in the region config file (as NonPhysicalPrimMax!).
     NonPhysicalPrimMax = 256