Re: [PATCH v3 0/6] MR2435: Fix activation context switching from SwitchToFiber().

[Jinoh Kang (＠iamahuman)]

> I must be missing something, when can dest == src?

If `ActivationContextStackPointer` already equals `dest` (fiber data or TEB).  I think it's not possible currently, unless the user tinkers with undocumented fields (which we don't need to support right now).
> Aren't we always moving from the fiber data to the TEB in ConvertFiberToThread()?

Or in the other direction in case of `ConvertThreadToFiber()`, but yes, `dest != src` in that case too.

I'll remove the check, since I realized it would not be necessary even if `dest == src` was indeed true.  Thank you for your review.