GetAllTopLevelWindows takes forever

[aristotelos]

Describe the bug
GetAllTopLevelWindows sometimes takes many seconds to complete, blocking process of the app.

I have also tried:

Automation.GetDesktop().FindAllChildren();
Automation.GetDesktop().FindAllChildren(cf => cf.ByProcessId(App.ProcessId));
Automation.GetDesktop().FindAllChildren(cf => cf.ByControlType(ControlType.Window));

They all timeout.

Code snippets

App.GetAllTopLevelWindows(Automation)

Additional context

Using UIA3. Caching is not enabled. When I browse to the dependency used in Visual Studio it is:

#region Assembly Interop.UIAutomationClient, Version=10.0.19041.0, Culture=neutral, PublicKeyToken=null
// ..\.nuget\packages\interop.uiautomationclient\10.19041.0\lib\netstandard2.0\Interop.UIAutomationClient.dll
// Decompiled with ICSharpCode.Decompiler 7.1.0.6543
#endregion

[Roemer]

This issue popped up from someone else. Are you able to debug into the FindAllChildren to see where it blocks?

[aristotelos]

Yes, it's in the NativeElement.FindAll call called from UIA3FrameworkAutomationElement.FindAll:

[sancanella]

Same here. The instruction blocks the process. Sometimes takes seconds and sometimes minutes. Here is the call stack: