Find operation can throw invalid operation

[ThomasPoucher]

Believe this is due to the cancellation token work where XPath is used and FindFirst is cancelled, leaving an object its retrieved in a different state

Additional context
: System.InvalidOperationException: Operation is not valid due to the current state of the object. at Interop.UIAutomationClient.IUIAutomationElement.FindFirst(TreeScope scope, IUIAutomationCondition condition) at SHAutomation.UIA3.UIA3FrameworkAutomationElement.FindFirst(TreeScope treeScope, ConditionBase condition) at SHAutomation.Core.AutomationElements.SHAutomationElement.FindFirstBase(TreeScope treeScope, ConditionBase condition) at SHAutomation.Core.AutomationElements.SHAutomationElement.FindFirstDescendantBase(ConditionBase condition) at SHAutomation.Core.AutomationElements.SHAutomationElement.<>c__DisplayClass204_0.b__0() at SHAutomation.Core.AutomationElements.SHAutomationElement.GetElement(Func1 function, Boolean shouldExist, ISHAutomationElement& element) at SHAutomation.Core.AutomationElements.SHAutomationElement.FindFirstDescendant(ConditionBase condition, TimeSpan timeout, Boolean waitUntilExists, CancellationToken& cancel) at SHAutomation.Core.AutomationElements.SHAutomationElement.FindFirstDescendant(Func2 conditionFunc, TimeSpan timeout, Boolean waitUntilExists