replace v6 with experimental v7 code

src/MpvNet.Windows/WPF/HandyControl/Tools/Interop/Handle/WpfSafeHandle.cs

@@ -0,0 +1,24 @@
+using System.Security;
+using Microsoft.Win32.SafeHandles;
+
+namespace HandyControl.Tools.Interop
+{
+    internal abstract class WpfSafeHandle : SafeHandleZeroOrMinusOneIsInvalid
+    {
+        private readonly int _collectorId;
+
+        [SecurityCritical]
+        protected WpfSafeHandle(bool ownsHandle, int collectorId) : base(ownsHandle)
+        {
+            HandleCollector.Add(collectorId);
+            _collectorId = collectorId;
+        }
+
+        [SecurityCritical, SecuritySafeCritical]
+        protected override void Dispose(bool disposing)
+        {
+            HandleCollector.Remove(_collectorId);
+            base.Dispose(disposing);
+        }
+    }
+}