Enable creating GraphicsCaptureItem from HWND by resolving the WindowId namespace mismatch

[radian-jp]

I am developing a C# application using Windows.Graphics.Capture.
I am facing a friction point when trying to use GraphicsCaptureItem.TryCreateFromWindowId(Windows.UI.WindowId windowId).
While Microsoft.UI.Win32Interop.GetWindowIdFromWindow(hwnd) exists to bridge the Win32 and WinUI worlds,
it returns a Microsoft.UI.WindowId struct. However, the Capture API expects a Windows.UI.WindowId struct.
Although these two structs share the same memory layout (a single ulong Value),
they reside in different namespaces and lack a built-in conversion or shared interface.
This forces developers to perform manual bitwise copying or "fake" casts,
which feels like an unsupported hack rather than a first-class developer experience.

To improve the interoperability between Win32 and Windows.Graphics.Capture,
I request one of the following:

1.Direct HWND Support:
Add GraphicsCaptureItem.TryCreateFromHwnd(IntPtr hwnd) to bypass the WindowId confusion entirely.

2.Official Conversion Utility:
Provide a standard method such as WindowId.FromHwnd(IntPtr hwnd) that returns the correct WindowId type for the target API,
or a bridge between Microsoft.UI.WindowId and Windows.UI.WindowId.

3.Documentation Clarity:
If WindowId.Value is guaranteed to be the same as an HWND handle,
please explicitly state this in the official documentation so developers can perform the cast safely.

The current lack of a clear, unified path for HWND-based capture is a significant hurdle for modernizing Windows apps.
I hope to see a more streamlined Interop experience in future updates.

Thank you for your consideration.