InputNonClientPointerSource no longer works after removing titlebar with SetBorderAndTitleBar

[HO-COOH]

Describe the bug

I am trying to completely self-drawing the titlebar buttons, so I use presenter.SetBorderAndTitleBar(false, false); to remove the titlebar together with the caption buttons. Then I found InputNonClientPointerSource to set draggable regions no longer works.

This is an issue for developers trying to completely self-drawing a window.

Steps to reproduce the bug

1. In window constructor, use this code to completely remove the titlebar (along with the standard caption buttons)

           ExtendsContentIntoTitleBar(true);
           auto presenter = AppWindow().Presenter().as<winrt::Microsoft::UI::Windowing::OverlappedPresenter>();
           presenter.SetBorderAndTitleBar(false, false);

2. Use this code to set a draggable region

   auto source = winrt::Microsoft::UI::Input::InputNonClientPointerSource::GetForWindowId(winrt::Microsoft::UI::GetWindowIdFromWindow(/*get hwnd from this window*/));
   source.ClearRegionRects(winrt::Microsoft::UI::Input::NonClientRegionKind::Caption);
   source.SetRegionRects(
       winrt::Microsoft::UI::Input::NonClientRegionKind::Caption,
       {
           winrt::Windows::Graphics::RectInt32{
               .X = (int)0,
               .Y = (int)0,
               .Width = (int)400,
               .Height = (int)400
           }
       }
   );

Expected behavior

No response

Screenshots

No response

NuGet package version

Windows App SDK 1.5.3: 1.5.240428000

Packaging type

Packaged (MSIX)

Windows version

Windows 10 version 1809 (17763, October 2018 Update)

IDE

No response

Additional context

No response

[github-actions[bot]]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one. Thank you!

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