Merge branch 'after-pr344-changes'

Author: alex-kulakov

ChangeLog/7.2.0-Beta-1-dev.txt

@@ -7,6 +7,9 @@
 [main] SqlDml.Truncate() is introduced.
 [main] WellKnown.MaxNumberOfConditions became obsolete, use new DomainConfiguration.MaxNumberOfConditions if needed
 [main] TypeHelper.GetSingleConstructor() and .GetSingleConstructorOrDefault() are marked obsolete
+[main] Session.DisableSaveChages() methods return null value in more cases. See methods' summaries
+[main] DirectSessionAccessor.OpenSystemLogicOnlyRegion() returns disposable struct instead of IDisposable
+[main] OperationRegistry's Disable/EnableSystemOperationRegistration methods return disposable struct instead of IDisposable
 [main] Temporary tables cleanup now uses TRUNCATE instead of DELETE when possible
 [main] Temporary tables population is increased with multi-row inserts - 256 and 16 items per INSERT
 [main] PersistParameterBinding has new field RowIndex, use it for multi-row inserts if needed

Orm/Xtensive.Orm/Orm/Operations/OperationRegistry.cs

@@ -21,7 +21,7 @@ public sealed class OperationRegistry
       private readonly OperationRegistry registry;
       private readonly bool prevIsSystemOperationRegistrationEnabled;
 
-      public SystemOperationRegistrationScope(OperationRegistry registry, bool enable)
+      internal SystemOperationRegistrationScope(OperationRegistry registry, bool enable)
       {
         this.registry = registry;
         prevIsSystemOperationRegistrationEnabled = registry.IsSystemOperationRegistrationEnabled;
@@ -32,9 +32,9 @@ public SystemOperationRegistrationScope(OperationRegistry registry, bool enable)
     }
 
     private readonly ICompletableScope blockingScope;
+    private readonly Collections.Deque<ICompletableScope> scopes = new();
     private bool isOperationRegistrationEnabled = true;
     private bool isUndoOperationRegistrationEnabled = true;
-    private Collections.Deque<ICompletableScope> scopes = new Collections.Deque<ICompletableScope>();
 
     /// <summary>
     /// Gets the session this instance is bound to.