Keyboard Accelerator with Menu (Alt) Modifier plays an alert sound (WinUI Desktop)

[bridgesquared]

Describe the bug If you add a keyboard accelerator to a control (typically button, appbarbutton etc.) that uses the Menu modifier (the Alt button), when the accelerator is invoked, the required action is processed but we get a spurious windows alert sound played at the same time. This is somewhat disconcerting for users as it makes them think they did something wrong and to be honest it's really annoying ;-) if you make a lot of use of Alt+ key combinations for desktop/keyboard interaction.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Create a new "Blank App, Packagde (WinUI in Desktop)" app
2. Modify the Main Window xaml to include a keyboard accelerator:

       <Button x:Name="myButton"
               Click="myButton_Click">
           <Button.KeyboardAccelerators>
               <KeyboardAccelerator Key="C"
                                    Modifiers="Menu" />
           </Button.KeyboardAccelerators>
           Click Me
       </Button>

3. Run the app
4. Activate the keyboard accelerator (Alt+C)
5. The button will change text but there will be a windows sound played at the same time

Expected behavior Because there is a valid accelerator I expect there to be no sound unless we add code to play it.

I would be happy with the sound being played if there wasn't an appropriate accelerator.

Screenshots Can add video if necessary, in case it's only my box?

Version Info

NuGet package version:

  <ItemGroup>
    <PackageReference Include="Microsoft.WinUI" Version="3.0.0-preview4.210210.4" />
    <Manifest Include="$(ApplicationManifest)" />
  </ItemGroup>

This was around in Preview 3 so it's not a regression.

Windows app type:	UWP	Win32
	Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)	Yes
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context

[StephenLPeters]

@Austin-Lamb FYI

[StephenLPeters]

I could not reproduce this issue in Winui2

[bridgesquared]

I could not reproduce this issue in Winui2

@StephenLPeters I believe this is likely to be a Desktop only issue, as I don't recall having the problem in UWP apps even though I used the same style?

[wbokkers]

This is stil an issue in Windows App SDK 1.1.4 (WinUI 3).

[github-actions[bot]]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[jeffdav]

This issue is still occurring.