Winforms: Narrator does not announce Up/Down buttons when targeting .NET Core 5.0

[Vino-Wang]

• .NET Core Version: (.NET Core SDK 5.0.100 – alpha1 – 5.0.100.15753)
• Have you experienced this same bug with .NET Framework?: No

Problem description:
In .Net Core 5.0 apps Narrator doesn't announce Up/Down buttons if a user uses CapsLock + kreyboard arrows combination. It works well in .Net 4.8 & .Net Core 3.1.

More Info:
This is a regression issue, it cannot reproduce in .Net Core 3.1.

Actual behavior:
Narrator does not announce Up/Down buttons.

Expected behavior:
Narrator should announce Up/Down buttons.

Minimal repro:

1. Download the attached .Net Core 5.0 app.
   UpDownButtons.zip

1. Run it and launch the Narrator and press possible arrows combination to observe the announcement.

[RussKie]

@Vino-Wang please note that the latest .NET 5.0 does not contain the latest version of WinForms (see #2395).

Please check what version of WinForms you have installed in C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\5.0.0-alpha1.???\System.Windows.Forms.dll

If the assembly is generated prior to 13 Nov, it won't have changes from 3.1.

[vladimir-krestov]

This is my request to create the new Issue.
I checked this on the latest version of master branch.

[RussKie]

Right, all good then.
Just making sure we're not filing unnecessary tickets.

Thank you

[Vino-Wang]

Verified with latest .NET 5.0 + VS 2019, this issue is fixed now. Narrator can read the Up/Down button like below: