Fix datagrid columns sort/resize/reorder #4476

src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs

@@ -457,7 +457,7 @@ namespace Avalonia.Controls
 
         private void DataGridColumnHeader_PointerPressed(object sender, PointerPressedEventArgs e)
         {
-            if (OwningColumn == null || e.Handled || !IsEnabled || e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+            if (OwningColumn == null || e.Handled || !IsEnabled || !e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
             {
                 return;
             }

src/Avalonia.Controls.DataGrid/DataGridRow.cs

@@ -789,7 +789,7 @@ namespace Avalonia.Controls
 
         private void DataGridRow_PointerPressed(PointerPressedEventArgs e)
         {
-            if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+            if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
             {
                 return;
             }

src/Avalonia.Controls.DataGrid/DataGridRowHeader.cs

@@ -162,7 +162,7 @@ namespace Avalonia.Controls.Primitives
         //TODO TabStop
         private void DataGridRowHeader_PointerPressed(object sender, PointerPressedEventArgs e)
         {
-            if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+            if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
             {
                 return;
             }