Use null propagation

.editorconfig

@@ -218,6 +218,8 @@ dotnet_diagnostic.RCS1264.severity = none
 dotnet_diagnostic.IDE0011.severity = warning
 # Use collection initializers or expressions.
 dotnet_diagnostic.IDE0028.severity = warning
+# Use null propagation.
+dotnet_diagnostic.IDE0031.severity = warning # Note: There is some overlap with RCS1146.
 # Order modifiers.
 dotnet_diagnostic.IDE0036.severity = warning
 # Use inferred member names.
@@ -295,9 +297,8 @@ dotnet_diagnostic.RCS1097.severity = warning
 # Mark local variable as const.
 dotnet_diagnostic.RCS1118.severity = warning
 # Use conditional access.
-dotnet_diagnostic.RCS1146.severity = warning
+dotnet_diagnostic.RCS1146.severity = warning # Note: There is some overlap with IDE0031.
 roslynator_null_conditional_operator.avoid_negative_boolean_comparison = true
-dotnet_diagnostic.IDE0031.severity = none
 # Abstract type should not have public constructors.
 dotnet_diagnostic.RCS1160.severity = warning
 # Unused parameter.

src/HotChocolate/Fusion/src/Fusion.Execution/Execution/OperationPlanContext.Pooling.cs

@@ -103,11 +103,9 @@ public async ValueTask DisposeAsync()
             _disposed = true;
             await _clientScope.DisposeAsync();
 
-            if (_pool is not null)
-            {
-                _pool.Return(this);
-                _pool = null;
-            }
+            var pool = _pool;
+            _pool = null;
+            pool?.Return(this);
         }
     }
 

src/Mocha/src/Mocha.Transport.Postgres/Connection/PostgresNotificationListener.cs

@@ -106,10 +106,7 @@ private async Task ListenAsync(CancellationToken cancellationToken)
         }
         finally
         {
-            if (_connection is not null)
-            {
-                _connection.Notification -= OnNotification;
-            }
+            _connection?.Notification -= OnNotification;
         }
     }