Some small fixes, these should help to track an issue the tests had.

[release]

src/Dapplo.Windows.Common/Structs/NativeRect.cs

@@ -277,7 +277,7 @@ public bool Equals(NativeRect other)
         ///     Checks if this NativeRect is empty
         /// </summary>
         /// <returns>true when empty</returns>
-        public bool IsEmpty => Width * Height == 0;
+        public bool IsEmpty => unchecked (Width * Height) == 0;
 
         /// <inheritdoc />
         [Pure]

src/Dapplo.Windows.Common/Structs/NativeSize.cs

@@ -204,7 +204,7 @@ public NativeSize(int width, int height)
 
         /// <inheritdoc />
         [Pure]
-        public int CompareTo(NativeSize other) => (other.Width * other.Height).CompareTo(Width * Height);
+        public int CompareTo(NativeSize other) => unchecked (other.Width * other.Height).CompareTo(unchecked(Width * Height));
 
         /// <inheritdoc />
         [Pure]

src/Dapplo.Windows.Common/Structs/NativeSizeFloat.cs

@@ -315,7 +315,7 @@ public bool Equals(NativeSizeFloat other)
 
         /// <inheritdoc />
         [Pure]
-        public int CompareTo(NativeSizeFloat other) => (other.Width * other.Height).CompareTo(Width * Height);
+        public int CompareTo(NativeSizeFloat other) => unchecked(other.Width * other.Height).CompareTo(unchecked (Width * Height));
 
         /// <inheritdoc />
         [Pure]

src/Dapplo.Windows.Messages/Dapplo.Windows.Messages.csproj

@@ -9,9 +9,10 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="ClrHeapAllocationAnalyzer" Version="1.0.0.9" >
+    <PackageReference Include="ClrHeapAllocationAnalyzer" Version="1.0.0.9">
         <PrivateAssets>all</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="Dapplo.Log" Version="1.3.11" />
     <PackageReference Include="System.Reactive" Version="4.1.2" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>

src/Dapplo.Windows.Messages/WinProcHandler.cs

@@ -28,6 +28,7 @@
 using System.Linq;
 using System.Reactive.Disposables;
 using System.Windows.Interop;
+using Dapplo.Log;
 
 #endregion
 
@@ -38,6 +39,7 @@ namespace Dapplo.Windows.Messages
     /// </summary>
     public class WinProcHandler
     {
+        private static readonly LogSource Log = new LogSource();
         private static HwndSource _hWndSource;
 
         /// <summary>
@@ -64,14 +66,12 @@ private HwndSource MessageHandlerWindow
                 {
                     return _hWndSource;
                 }
-                if (_hWndSource != null && !_hWndSource.IsDisposed)
-                {
-                    return _hWndSource;
-                }
                 // Create a new message window
                 _hWndSource = CreateMessageWindow();
+                Log.Verbose().WriteLine("MessageHandlerWindow with handle {0} was created.", _hWndSource.Handle);
                 _hWndSource.Disposed += (sender, args) =>
                 {
+                    Log.Verbose().WriteLine("MessageHandlerWindow with handle {0} is disposed.", _hWndSource.Handle);
                     UnsubscribeAllHooks();
                 };
                 // Hook automatic removing of all the hooks