Automatic span nested with the wrong transaction when using multiple windows.

[brustolin]

Description

iPad allows applications to support multiple windows. An automatic span may be nested with the wrong transaction if two screens are opened simultaneously in different windows.

The first image has two http requests, the second has none.
Each transaction must have one request.
This can lead to confusion.

[brustolin]

We cannot use Threads as a way to check from which view controller a new transaction is created since every view controller shared the same main thread.