Fix: Plausible Exception while closing an Application (#10631)

* Throw specific Win32Exception in PostMessage and move caller in try-catch

* Pre-catch win32 error to avoid plausible thread issues

* Update src/Microsoft.DotNet.Wpf/src/Shared/MS/Win32/UnsafeNativeMethodsCLR.cs

Co-authored-by: h3xds1nz <[email protected]>

---------

Co-authored-by: h3xds1nz <[email protected]>

Author: harshit7962

src/Microsoft.DotNet.Wpf/src/Shared/MS/Win32/ManagedWndProcTracker.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 //#define LOGGING
@@ -120,7 +120,12 @@ private static void HookUpDefWindowProc(IntPtr hwnd)
                 try
                 {
                     result = UnsafeNativeMethods.SetWindowLong(new HandleRef(null,hwnd), NativeMethods.GWL_WNDPROC, defWindowProc);
-}
+
+                    if (result != IntPtr.Zero)
+                    {
+                        UnsafeNativeMethods.PostMessage(new HandleRef(null, hwnd), WindowMessage.WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
+                    }
+                }
                 catch(System.ComponentModel.Win32Exception e)
                 {
                     // We failed to change the window proc.  Now what?
@@ -133,10 +138,6 @@ private static void HookUpDefWindowProc(IntPtr hwnd)
                         throw;
                     }
                 }
-                if (result != IntPtr.Zero )
-                {
-                    UnsafeNativeMethods.PostMessage(new HandleRef(null,hwnd), WindowMessage.WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
-                }
             }
         }