Bug 1515: Internal InvalidOperationException on each call to Session.ListDirectory

https://winscp.net/tracker/1515

Source commit: 037416493e94f7830fd62fc3813fa1477f136194

dotnet/Session.cs

@@ -454,6 +454,7 @@ namespace WinSCP
                             }
                         }
 
+                        lsReader.ReadToEnd(LogReadFlags.ThrowFailures);
                         groupReader.ReadToEnd(LogReadFlags.ThrowFailures);
                     }
                     else