Potential sign-extending cast when a zero-extending cast was intended

Testing out some new CodeQL rules locally. One of them flagged a line in WPF that appears suspicious.

https://github.com/dotnet/wpf/blob/1e89865cc87be0daf939d00b1b2667cd485efa93/src/Microsoft.DotNet.Wpf/src/UIAutomation/UIAutomationClientSideProviders/MS/Internal/AutomationProxies/CommonXSendMessage.cs#L1535

This expression always returns **false** because an explicit cast from `int` -> `ulong` is actually treated by the compiler as `int` -> `long` -> `ulong` (note the intermediate implicit sign-extending cast).