Index: VTConfig.inc
===================================================================
--- VTConfig.inc	(revision 2731)
+++ VTConfig.inc	(working copy)
@@ -22,7 +22,7 @@
 
 
 //Lazarus port options
-{$define EnableOLE}
+{.$define EnableOLE}
 {.$define EnableNativeTVM}
 {.$define EnablePrint}
 {.$define EnableNCFunctions}
@@ -42,7 +42,7 @@
 
 //under linux the performance is poor with threading enabled
 {$ifdef Windows}
-  {$define EnableThreadSupport}
+  {.$define EnableThreadSupport}
 {$endif}
 {$ifdef CPU64}
   {$define PACKARRAYPASCAL}
Index: VirtualTrees.pas
===================================================================
--- VirtualTrees.pas	(revision 2731)
+++ VirtualTrees.pas	(working copy)
@@ -745,6 +745,7 @@
     toAutoHideButtons,          // Node buttons are hidden when there are child nodes, but all are invisible.
     toAutoDeleteMovedNodes,     // Delete nodes which where moved in a drag operation (if not directed otherwise).
     toDisableAutoscrollOnFocus, // Disable scrolling a node or column into view if it gets focused.
+    toDisableAutoscrollHorizontal, // Only autoscroll on focus vertically never horizontally
     toAutoChangeScale,          // Change default node height automatically if the system's font scale is set to big fonts.
     toAutoFreeOnCollapse,       // Frees any child node after a node has been collapsed (HasChildren flag stays there).
     toDisableAutoscrollOnEdit,  // Do not center a node horizontally when it is edited.
@@ -2018,7 +2019,7 @@
     var Allowed: Boolean) of object;
   TVTDragOverEvent = procedure(Sender: TBaseVirtualTree; Source: TObject; Shift: TShiftState; State: TDragState;
     const Pt: TPoint; Mode: TDropMode; var Effect: LongWord; var Accept: Boolean) of object;
-  TVTDragDropEvent = procedure(Sender: TBaseVirtualTree; Source: TObject; DataObject: IDataObject;
+  TVTDragDropEvent = procedure(Sender: TBaseVirtualTree; Source: TObject; {DataObject: IDataObject;}
     Formats: TFormatArray; Shift: TShiftState; const Pt: TPoint; var Effect: LongWord; Mode: TDropMode) of object;
   TVTRenderOLEDataEvent = procedure(Sender: TBaseVirtualTree; const FormatEtcIn: TFormatEtc; out Medium: TStgMedium;
     ForClipboard: Boolean; var Result: HRESULT) of object;
@@ -2543,6 +2544,7 @@
     procedure BeginOperation;
     function CalculateSelectionRect(X, Y: Integer): Boolean; virtual;
     function CanAutoScroll: Boolean; virtual;
+    function CanScroll(const ClientMousePos: TPoint): Boolean; virtual;
     function CanShowDragImage: Boolean; virtual;
     procedure Change(Node: PVirtualNode); virtual;
     procedure ChangeScale(M, D: Integer); override;
@@ -3015,6 +3017,7 @@
     function GetNextNoInit(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = False): PVirtualNode;
     function GetNextSelected(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = False): PVirtualNode;
     function GetNextSibling(Node: PVirtualNode): PVirtualNode;
+    function GetNextSiblingNoInit(Node: PVirtualNode): PVirtualNode;
     function GetNextVisible(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = True): PVirtualNode;
     function GetNextVisibleNoInit(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = True): PVirtualNode;
     function GetNextVisibleSibling(Node: PVirtualNode): PVirtualNode;
@@ -3033,6 +3036,7 @@
     function GetPreviousNoInit(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = False): PVirtualNode;
     function GetPreviousSelected(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = False): PVirtualNode;
     function GetPreviousSibling(Node: PVirtualNode): PVirtualNode;
+    function GetPreviousSiblingNoInit(Node: PVirtualNode): PVirtualNode;
     function GetPreviousVisible(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = True): PVirtualNode;
     function GetPreviousVisibleNoInit(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = True): PVirtualNode;
     function GetPreviousVisibleSibling(Node: PVirtualNode): PVirtualNode;
@@ -13858,7 +13862,7 @@
     FFocusedColumn := Value;
     if Assigned(FFocusedNode) and not (toDisableAutoscrollOnFocus in FOptions.FAutoOptions) then
     begin
-      if ScrollIntoView(FFocusedNode, toCenterScrollIntoView in FOptions.SelectionOptions, True) then
+      if ScrollIntoView(FFocusedNode, toCenterScrollIntoView in FOptions.SelectionOptions, not (toDisableAutoscrollHorizontal in FOptions.FAutoOptions)) then
         InvalidateNode(FFocusedNode);
     end;
 
@@ -15036,7 +15040,8 @@
   LeaveStates := [tsHint];
   if [tsWheelPanning, tsWheelScrolling] * FStates = [] then
   begin
-    KillTimer(Handle, ScrollTimer);
+    if HandleAllocated then
+      KillTimer(Handle, ScrollTimer);
     LeaveStates := LeaveStates + [tsScrollPending, tsScrolling];
   end;
   DoStateChange([], LeaveStates);
@@ -15660,7 +15665,7 @@
                 if (Shift = [ssCtrlOS]) and not ActAsGrid then
                 begin
                   ScrollIntoView(Node, toCenterScrollIntoView in FOptions.SelectionOptions,
-                    not (toDisableAutoscrollOnFocus in FOptions.FAutoOptions));
+                    not (toDisableAutoscrollHorizontal in FOptions.FAutoOptions));
                   if (CharCode = VK_HOME) and not UseRightToLeftAlignment then
                     SetOffsetX(0)
                   else
@@ -17879,7 +17884,7 @@
       if hoVisible in FHeader.FOptions then
         Dec(Y, FHeader.Height);
 
-      if (Y > 0) and (Y < Integer(FDefaultNodeHeight)) and (FOffsetY <> 0) then
+      if (Y < Integer(FDefaultNodeHeight)) and (FOffsetY <> 0) then
         Include(Result, sdUp);
 
       //todo: probably the code below is bug due to poor timeGetTime implementation
@@ -18424,7 +18429,7 @@
 
 begin
   if Assigned(FOnDragDrop) then
-    FOnDragDrop(Self, Source, DataObject, Formats, Shift, Pt, Effect, Mode);
+    FOnDragDrop(Self, Source, {DataObject, }Formats, Shift, Pt, Effect, Mode);
 end;
 
 //----------------------------------------------------------------------------------------------------------------------
@@ -18576,7 +18581,7 @@
       InvalidateNode(FFocusedNode);
       if (FUpdateCount = 0) and not (toDisableAutoscrollOnFocus in FOptions.FAutoOptions) then
         ScrollIntoView(FFocusedNode, (toCenterScrollIntoView in FOptions.SelectionOptions) and
-          (MouseButtonDown * FStates = []), True);
+          (MouseButtonDown * FStates = []), not (toDisableAutoscrollHorizontal in FOptions.FAutoOptions));
     end;
 
     // Reset range anchor if necessary.
@@ -19392,7 +19397,7 @@
   ClientP := ScreenToClient(P);
   Panning := [tsWheelPanning, tsWheelScrolling] * FStates <> [];
 
-  if IsMouseSelecting or InRect or Panning then
+  if IsMouseSelecting or InRect or Panning or CanScroll(ClientP) then
   begin
     DeltaX := 0;
     DeltaY := 0;
@@ -21111,7 +21116,7 @@
       if NewNode or NewColumn then
       begin
         ScrollIntoView(FFocusedNode, toCenterScrollIntoView in FOptions.SelectionOptions,
-                       not (toDisableAutoscrollOnFocus in FOptions.FAutoOptions));
+                       not (toDisableAutoscrollHorizontal in FOptions.FAutoOptions));
         DoFocusChange(FFocusedNode, FFocusedColumn);
       end;
     end;
@@ -21809,7 +21814,7 @@
 
 begin
   if Y < 0 then
-    Y := 0;
+    Exit(nil);
 
   AbsolutePos := Y;
   if Relative then
@@ -24335,6 +24340,12 @@
   DoCanEdit(Node, Column, Result);
 end;
 
+function TBaseVirtualTree.CanScroll(const ClientMousePos: TPoint): Boolean;
+// Determines whether auto scrolling can occur based on current mouse cursor position.
+begin
+  Result := False;
+end;
+
 //----------------------------------------------------------------------------------------------------------------------
 
 procedure TBaseVirtualTree.Clear;
@@ -26446,6 +26457,22 @@
 
 //----------------------------------------------------------------------------------------------------------------------
 
+function TBaseVirtualTree.GetNextSiblingNoInit(Node: PVirtualNode): PVirtualNode;
+
+// Returns the next sibling of Node performing no initialization.
+
+begin
+  Result := Node;
+  if Assigned(Result) then
+  begin
+    Assert(Result <> FRoot, 'Node must not be the hidden root node.');
+
+    Result := Result.NextSibling;
+  end;
+end;
+
+//----------------------------------------------------------------------------------------------------------------------
+
 function TBaseVirtualTree.GetNextVisible(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = True): PVirtualNode;
 
 // Returns next node in tree, with regard to Node, which is visible.
@@ -27064,6 +27091,22 @@
 
 //----------------------------------------------------------------------------------------------------------------------
 
+function TBaseVirtualTree.GetPreviousSiblingNoInit(Node: PVirtualNode): PVirtualNode;
+
+// Get next sibling of Node, performes no initialization.
+
+begin
+  Result := Node;
+  if Assigned(Result) then
+  begin
+    Assert(Result <> FRoot, 'Node must not be the hidden root node.');
+
+    Result := Result.PrevSibling;
+  end;
+end;
+
+//----------------------------------------------------------------------------------------------------------------------
+
 function TBaseVirtualTree.GetPreviousVisible(Node: PVirtualNode; ConsiderChildrenAbove: Boolean = True): PVirtualNode;
 
 // Returns the previous node in tree, with regard to Node, which is visible.
@@ -29252,6 +29295,7 @@
   HScrollBarVisible: Boolean;
   ScrolledVertically,
   ScrolledHorizontally: Boolean;
+  OffY, OffYM: Integer;
 
 begin
   //todo: minimize calls to ClientHeight and ClientWidth
@@ -29296,7 +29340,14 @@
         if Center then
           SetOffsetY(FOffsetY - R.Bottom + ClientHeight div 2)
         else
-          SetOffsetY(FOffsetY - R.Bottom + ClientHeight);
+        begin
+          // Leave additional space at the bottom to have scrollrect start with full row.
+          OffY  := FOffsetY - R.Bottom + ClientHeight;
+          OffYM := OffY mod DefaultNodeHeight;
+          if OffYM <> 0 then
+            OffY := OffY - (DefaultNodeHeight + OffYM);
+          SetOffsetY(OffY);
+        end;
         // When scrolling up and the horizontal scroll appears because of the operation
         // then we have to move up the node the horizontal scrollbar's height too
         // in order to avoid that the scroll bar hides the node which we wanted to have in view.
@@ -29350,10 +29401,13 @@
   end
   else
   begin
-    if ColumnRight > ClientWidth then
-      NewOffset := FEffectiveOffsetX + (ColumnRight - ClientWidth)
-    else if ColumnLeft < Header.Columns.GetVisibleFixedWidth then
-      NewOffset := FEffectiveOffsetX - (Header.Columns.GetVisibleFixedWidth - ColumnLeft);
+    if FHeader.Columns.Count > 1 then
+    begin
+      if ColumnRight > ClientWidth then
+        NewOffset := FEffectiveOffsetX + (ColumnRight - ClientWidth)
+      else if ColumnLeft < Header.Columns.GetVisibleFixedWidth then
+        NewOffset := FEffectiveOffsetX - (Header.Columns.GetVisibleFixedWidth - ColumnLeft);
+    end;
     if NewOffset <> FEffectiveOffsetX then
     begin
       if UseRightToLeftAlignment then
Index: include/intf/qt/vtgraphicsi.inc
===================================================================
--- include/intf/qt/vtgraphicsi.inc	(revision 2731)
+++ include/intf/qt/vtgraphicsi.inc	(working copy)
@@ -284,7 +284,7 @@
 
         // Load MM4 with 128 to allow for saturated biasing.
         MOV     EAX, 128
-        DB      $0F, $6E, AlphaBlendLineConstant$E0          /// MOVD      MM4, EAX
+        DB      $0F, $6E, $E0          /// MOVD      MM4, EAX
         DB      $0F, $61, $E4          /// PUNPCKLWD MM4, MM4
         DB      $0F, $62, $E4          /// PUNPCKLDQ MM4, MM4
 
Index: units/carbon/fakemmsystem.pas
===================================================================
--- units/carbon/fakemmsystem.pas	(revision 2731)
+++ units/carbon/fakemmsystem.pas	(working copy)
@@ -15,6 +15,9 @@
 
 implementation
 
+uses
+  LCLIntf;
+
 function timeBeginPeriod(x1: DWord): DWord;
 begin
 
@@ -26,12 +29,8 @@
 end;
 
 function timeGetTime: DWORD;
-var
-  ATime: TSystemTime;
 begin
-  //todo: properly implement
-  GetLocalTime(ATime);
-  Result := ATime.MilliSecond;
+  Result := GetTickCount;
 end;
 
 end.
Index: units/qt/fakemmsystem.pas
===================================================================
--- units/qt/fakemmsystem.pas	(revision 2731)
+++ units/qt/fakemmsystem.pas	(working copy)
@@ -15,6 +15,9 @@
 
 implementation
 
+uses
+  LCLIntf;
+
 function timeBeginPeriod(x1: DWord): DWord;
 begin
 
@@ -26,12 +29,8 @@
 end;
 
 function timeGetTime: DWORD;
-var
-  ATime: TSystemTime;
 begin
-  //todo: properly implement
-  GetLocalTime(ATime);
-  Result := ATime.MilliSecond;
+  Result := GetTickCount;
 end;
 
 end.
Index: units/win32/virtualpanningwindow.pas
===================================================================
--- units/win32/virtualpanningwindow.pas	(revision 2731)
+++ units/win32/virtualpanningwindow.pas	(working copy)
@@ -41,9 +41,10 @@
     PanningObject:=TVirtualPanningWindow(GetWindowLongPtrW(Window,GWL_USERDATA));
     if Assigned(PanningObject) then
       PanningObject.HandlePaintMessage;
+	Result := 0;
   end
   else
-    DefWindowProc(Window,Msg,WPara,LPara);
+    Result := DefWindowProc(Window,Msg,WPara,LPara);
 end;
 
 var
@@ -87,8 +88,7 @@
   with Position do
     FHandle := CreateWindowEx(WS_EX_TOOLWINDOW, PanningWindowClass.lpszClassName, nil, WS_POPUP, X - 16, Y - 16,
       32, 32, OwnerHandle, 0, HInstance, nil);
-  //todo use SetWindowLongPtr later
-  SetWindowLong(FHandle,GWL_USERDATA,PtrInt(Self));
+  SetWindowLongPtr(FHandle,GWL_USERDATA,LONG_PTR(Self));
   
   FImage := TBitmap.Create;
 end;