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I've noticed an issue with the mouse on SDL WinRT.

If a mouse button is held, other mouse button events do not get fired / handled.
e.g.

Hold MOUSE1 - SDL_MOUSEBUTTONDOWN (1) fired correctly
Hold MOUSE2 - no event fired

The following situation IS handled correctly...
Hold MOUSE1 - SDL_MOUSEBUTTONDOWN (1) fired correctly
Release MOUSE1 - SDL_MOUSEBUTTONUP (1) fired correctly

Hold MOUSE2 - SDL_MOUSEBUTTONDOWN (3) fired correctly
Release MOUSE1 - SDL_MOUSEBUTTONUP (3) fired correctly

private static SDL.SDL_EventFilter _winRTEvents = WinRTEvents;
private static unsafe int WinRTEvents(IntPtr userdata, IntPtr evtPtr)
{
	SDL.SDL_Event* evt = (SDL.SDL_Event*)evtPtr;
	switch (evt->type)
	{
		case SDL.SDL_EventType.SDL_MOUSEBUTTONDOWN:
			Debug.WriteLine($"WinRT event handler SDL_MOUSEBUTTONDOWN {evt->button.button}");
			break;

		case SDL.SDL_EventType.SDL_MOUSEBUTTONUP:
			Debug.WriteLine($"WinRT event handler SDL_MOUSEBUTTONUP {evt->button.button}");
			break;

		case SDL.SDL_EventType.SDL_APP_TERMINATING:
			Debug.WriteLine("WinRT event handler SDL_APP_TERMINATING -> Exiting()");
			break;

		case SDL.SDL_EventType.SDL_APP_WILLENTERBACKGROUND:
			Debug.WriteLine("WinRT event handler SDL_APP_WILLENTERBACKGROUND -> Suspending()");
			break;

		case SDL.SDL_EventType.SDL_APP_WILLENTERFOREGROUND:
			Debug.WriteLine("WinRT event handler SDL_APP_WILLENTERFOREGROUND -> Resuming()");
			break;
	}

	return 1;
}

public void Run(LaunchOptions launchOptions)
{
	_launchOptions = launchOptions;

	SDL.SDL_SetHint("SDL_WINRT_HANDLE_BACK_BUTTON", "1");
	SDL.SDL_AddEventWatch(_winRTEvents, IntPtr.Zero);
	SDL.SDL_main_func mainFunction = FakeMain;
	SDL.SDL_WinRTRunApp(mainFunction, IntPtr.Zero);
}

Issue happens with / without the custom event filter

This is a WinRT / UWP project running on Windows 10 Home 10.0.19041 Build 19041

SDL is used via FNA Core (DEBUG / x64)
FNA source up to date as at Nov 14, 2020
FNA dependences (FNA3D, etc) built from source on Nov29, 2020
SDL version 2.0.12 (stable)


FNA issue https://github.com/FNA-XNA/FNA/issues/338