Keyboard navigation to a Hyperlink doesn't show the tooltip

[SamBent]

• .NET Core Version: 3.0 and above
• Windows version: all
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
• Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? no

• Security issues and bugs should be reported privately, learn more via our responsible disclosure guidelines.

  Problem description:

1. Run (revised) sample app attached to #4612.
2. Press TAB until focus arrives on the Hyperlink labelled "This is a Hyperlink with a Tooltip" (look for the focus adorner).

3. Wait for the tooltip to appear

   Actual behavior: The tooltip never appears.

   Expected behavior: The tooltip appears after 5 seconds.

By contrast, move the mouse over the Hyperlink - the tooltip appears after 5 seconds.

Keyboard navigation should show the tooltip on a Hyperlink (or any FrameworkContentElement), just as it does on a FrameworkElement.

[ryalanms]

Fixed by @SamBent's change.

[SamBent]

Fixed by the tooltip work in 6.0-preview7.