Raise if scanner cannot find requested position #2664
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vinistock
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bugfix
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Motivation
Trying to understand #2446
This PR starts raising if the document scanner cannot find the requested position. It prints both the document state and the requested position, so that we can understand if the document state got corrupted or if the requested position doesn't make sense.
Implementation
If we exceed the search loop, but the request line is still different than the one we found, then we couldn't find the correct position and we can raise.
This is not the solution for the problem, it's just a way to diagnose it.
Automated Tests
Added a test.