fix touch issues

src/Avalonia.Input/GestureRecognizers/ScrollGestureRecognizer.cs

@@ -101,7 +101,7 @@ namespace Avalonia.Input.GestureRecognizers
                 if (_scrolling)
                 {
                     var vector = _trackedRootPoint - rootPoint;
-                    var elapsed = _lastMoveTimestamp.HasValue ?
+                    var elapsed = _lastMoveTimestamp.HasValue && _lastMoveTimestamp < e.Timestamp ?
                         TimeSpan.FromMilliseconds(e.Timestamp - _lastMoveTimestamp.Value) :
                         TimeSpan.Zero;
                     

src/Avalonia.Input/PointerPoint.cs

@@ -45,8 +45,6 @@ namespace Avalonia.Input
             IsRightButtonPressed = modifiers.HasAllFlags(RawInputModifiers.RightMouseButton);
             IsXButton1Pressed = modifiers.HasAllFlags(RawInputModifiers.XButton1MouseButton);
             IsXButton2Pressed = modifiers.HasAllFlags(RawInputModifiers.XButton2MouseButton);
-            IsBarrelButtonPressed = modifiers.HasAllFlags(RawInputModifiers.BarrelPenButton);
-            IsEraser = modifiers.HasAllFlags(RawInputModifiers.PenEraser);
 
             // The underlying input source might be reporting the previous state,
             // so make sure that we reflect the current state

src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs

@@ -488,6 +488,10 @@ namespace Avalonia.Win32
                 case WindowsMessage.WM_POINTERLEAVE:
                     {
                         GetDevicePointerInfo(wParam, out var device, out var info, ref timestamp);
+                        if (device is TouchDevice)
+                        {
+                            break;
+                        }
                         var point = PointToClient(new PixelPoint(info.ptPixelLocationX, info.ptPixelLocationY));
                         var modifiers = GetInputModifiers(info.dwKeyStates);
 
@@ -798,8 +802,7 @@ namespace Avalonia.Win32
                 case PointerInputType.PT_PEN:
                     return ToEventType(info.ButtonChangeType);
                 case PointerInputType.PT_TOUCH:
-                    if (info.pointerFlags.HasFlag(PointerFlags.POINTER_FLAG_CANCELED) ||
-                        !info.pointerFlags.HasFlag(PointerFlags.POINTER_FLAG_CONFIDENCE))
+                    if (info.pointerFlags.HasFlag(PointerFlags.POINTER_FLAG_CANCELED))
                     {
                         return RawPointerEventType.TouchCancel;
                     }