Viewport corruption with AMD Radeon on window resize

1. load https://github.com/microsoft/DirectX-Graphics-Samples/tree/master/Samples/Desktop/D3D12HelloWorld/src/HelloTriangle

2. modify https://github.com/microsoft/DirectX-Graphics-Samples/blob/master/Samples/Desktop/D3D12HelloWorld/src/HelloTriangle/D3D12HelloTriangle.cpp#L201 with the following code

        // Define the geometry for a triangle.
        Vertex triangleVertices[] =
        {
            { { 0.0f, 1.f * m_aspectRatio, 0.0f }, { 1.0f, 0.0f, 0.0f, 1.0f } },
            { { 1.f, -1.f * m_aspectRatio, 0.0f }, { 0.0f, 1.0f, 0.0f, 1.0f } },
            { { -1.f, -1.f * m_aspectRatio, 0.0f }, { 0.0f, 0.0f, 1.0f, 1.0f } }
        };

This will make the bug visible as the triangle will now extend to the window extents.

3. run app and resize the window a bit using the mouse (ex. bottom right corner)

4. see corruption in the viewport as it seems mismatched to the window client area
   

5. moving the window with the title bar will fix the bug

DxDiag.txt

Start with Samples/Desktop/D3D12HelloWorld/src/HelloTriangle/D3D12HelloTriangle.cpp, including the geometry change at line 201, and run the HelloTriangle sample on an AMD Radeon system. Resize the window with the mouse and compare the viewport with the client area; done means repeated resizing no longer produces corruption and moving the window is not needed to correct it.