[Flaky Test] listviewlabeleditaccessibleobject_ispatternsupported_returnsexpected

[runfoapp]

Runfo Tracking Issue: [Flaky Test] listviewlabeleditaccessibleobject_ispatternsupported_returnsexpected

Build	Definition	Kind	Run Name
181185	dotnet-winforms CI	PR 8672	Windows_arm64-xunit

Build Result Summary

Day Hit Count	Week Hit Count	Month Hit Count
0	0	1

[dreddy-work]

Error message
System.NullReferenceException : Object reference not set to an instance of an object.
Stack trace
   at System.Windows.Forms.Tests.ListViewLabelEditAccessibleObjectTests.ListViewLabelEditAccessibleObject_IsPatternSupported_ReturnsExpected() in /_/src/System.Windows.Forms/tests/UnitTests/System/Windows/Forms/ListViewLabelEditAccessibleObjectTests.cs:line 67
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)

[JeremyKuhne]

The ListViewLabelEditAccessibleObjectTests tests depend on focus being set to have an active edit control- see CreateListViewAndStartEditing. This class should be in its own collection and run sequentially (which is the default for the methods inside of a given class).

Should look at other calls to SetFocus in tests to see if any other classes need the same treatment.

[dreddy-work]

closing against #8864.