ArgumentNullException in ToolTipService.GetBetweenShowDelay

[lindexi]

Description

The stacktrace:

System.ArgumentNullException: Value cannot be null. (Parameter 'element')
   in int ToolTipService.GetBetweenShowDelay(DependencyObject element)
   in void PopupControlService.CloseToolTip(ToolTip tooltip)
   in void PopupControlService.OnPostProcessInput(object sender, ProcessInputEventArgs e)
   in void InputManager.RaiseProcessInputEventHandlers(Tuple<ProcessInputEventHandler, Delegate[]> postProcessInput, ProcessInputEventArgs processInputEventArgs)
   in bool InputManager.ProcessStagingArea()
   in bool InputManager.ProcessInput(InputEventArgs input)
   in void MouseDevice.Synchronize()
   in void MouseDevice.ChangeMouseCapture(IInputElement mouseCapture, IMouseInputProvider providerCapture, CaptureMode captureMode, int timestamp)
   in bool MouseDevice.Capture(IInputElement element, CaptureMode captureMode)
   in bool UIElement.CaptureMouse()

Reproduction Steps

Be looking for...

Expected behavior

Work well

Actual behavior

Throw exception

Regression?

No response

Known Workarounds

No response

Impact

No response

Configuration

No response

Other information

No response

[lindexi]

Duplicate of #6319

[lindexi]

I'm concerned that the fix for #7417 may not have completely resolved the issue. The reason being, I noticed no changes when I cherry-picked the changes from #7417 into my code branch. Please refer to dotnet-campus/dotnetCampus.CustomWpf#27. This implies that my code has already incorporated the fix. However, I'm still receiving the same exception message.

Upon reviewing the code, I found that the ToolTip parameter in the PopupControlService.CloseToolTip method comes from a _currentToolTip field. This suggests that it's indeed possible to get a null Owner during the MouseDevice.Capture process.