Merge branch '7.1'

# Conflicts:
#	Version.props

Author: alex-kulakov

Orm/Xtensive.Orm.Tests/Issues/IssueJira0451_ConnectionInitializationSql.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2013-2021 Xtensive LLC.
+// Copyright (C) 2013-2021 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 // Created by: Denis Krjuchkov
@@ -74,7 +74,8 @@ private static DomainConfiguration BuildConfiguration(string database, DomainUpg
     private static ConnectionInfo OverrideDatabase(ConnectionInfo connectionInfo, string database)
     {
       var builder = new SqlConnectionStringBuilder(connectionInfo.ConnectionString) {
-        InitialCatalog = database
+        InitialCatalog = database,
+        Encrypt = false
       };
       return new ConnectionInfo(WellKnown.Provider.SqlServer, builder.ToString());
     }

Orm/Xtensive.Orm/Orm/Linq/LocalCollectionKeyTypeExtractor.cs

@@ -24,14 +24,14 @@ public static Type Extract(BinaryExpression expression)
         return key.EntityType.UnderlyingType;
       }
 
-      var expr = VisitBinaryExpession(expression);
+      var expr = VisitBinaryExpression(expression);
       if (expr.Type.IsSubclassOf(WellKnownOrmTypes.Entity)) {
         return expr.Type;
       }
       throw new NotSupportedException(string.Format(Strings.ExCurrentTypeXIsNotSupported, expr.Type));
     }
 
-    private static Expression VisitBinaryExpession(BinaryExpression binaryExpression)
+    private static Expression VisitBinaryExpression(BinaryExpression binaryExpression)
     {
       if (!(binaryExpression.Right is MemberExpression memberExpression)) {
         throw new InvalidOperationException(string.Format(Strings.ExCantConvertXToY, binaryExpression.Type, typeof(MemberExpression)));

Orm/Xtensive.Orm/Orm/Linq/Translator.Queryable.cs

@@ -33,7 +33,9 @@ internal sealed partial class Translator : QueryableVisitor
     private readonly TranslatorContext context;
     private readonly bool tagsEnabled;
 
-    internal TranslatorState State { get; private set; } = TranslatorState.InitState;
+    internal TranslatorState State { get; private set; } = new(TranslatorState.InitState) {
+      NonVisitableExpressions = new()
+    };
 
     protected override Expression VisitConstant(ConstantExpression c)
     {

Orm/Xtensive.Orm/Orm/Linq/TranslatorState.cs

@@ -70,7 +70,7 @@ public TranslatorScope(Translator translator)
 
 
     /// <summary>
-    /// Expessions that were constructed during original expression translation
+    /// Expressions that were constructed during original expression translation
     /// and aim to replace original parts so they are avoidable to visit by Linq translator.
     /// </summary>
     /// <remarks>