ToolTip shows when owner acquires focus via non-keyboard

[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 sample app attached to #4612.
  2. Click in the TextBox labeled "TextBox".
  3. (optional) wait for ToolTip to appear and disappear (5 sec, 15 sec)
  4. Alt+TAB to another app
  5. Alt+TAB back to the sample
  6. Wait 5 seconds

Steps 4-5 can be replaced by other ways to move focus away from the app, then back to it, e.g.: 4a. Click on app's icon in the system taskbar to minimize the app; 5a. click again to restore the app 4b. Click on another app; 5b. click on sample app's title bar to reactivate it (etc.)

Actual behavior: ToolTip appears

Expected behavior: ToolTip does not appear

ToolTip should display when keyboard navigation (e.g. TAB) moves focus to the TextBox, but not when focus moves by non-keyboard means.

[SamBent]

Fixed by the tooltip work in 6.0-preview7.