AppInstance redirection APIs don't transfer foreground rights

[andrewleader]

Describe the bug

I'm trying to use AppLifecycle.AppInstance redirection APIs to redirect to a single instance (and then bring that instance to the foreground), however it seems the foreground rights aren't being passed to the main instance when using RedirectActivationTo().

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Create a WinUI 3 desktop app using 1.0 Preview 1 and add AppInstance with single-instance redirection
   1. Call GetCurrent().GetActivatedEventArgs() first
   2. Then call FindOrRegisterForKey("main")
   3. If that main instance is current, register the Activated event
   4. Otherwise, call main.RedirectActivationToAsync(args)
2. Within the Activated event, attempt to bring the window to the foreground
   1. Get the DispatcherQueue to enter the UI thread
   2. Then call the Activate() method on your window
   3. Expected: Window comes to foreground
   4. Actual: Nothing happens

Version Info

NuGet package version:

Microsoft.WindowsAppSDK 1.0.0-preview1

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)

Additional context

[andrewleader]

Fixed for 1.0 Preview 2 via #1416

[duracellko]

How does this work? It doesn't seem to work in my app.

I created small sample.
SingleAppInst.zip

Could you have a look at what is missing there?

When I select the app in the Start menu second time, the app does not go to foreground.

[duracellko]

How does this work? It doesn't seem to work in my app.

I created small sample. SingleAppInst.zip

Could you have a look at what is missing there?

When I select the app in the Start menu second time, the app does not go to foreground.

I found the way. Instead of Window.Activate() use https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setforegroundwindow

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool SetForegroundWindow(IntPtr hWnd);

IntPtr hWnd = WindowNative.GetWindowHandle(window);
SetForegroundWindow(hWnd);