fix: Save the right offset in state file after file trucation #72
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Description of the issue
Currently, the save state will not decrease the offset after file has
trucated.
Description of changes
In this fix, we add a sequence number to offset, when file trucation
happens, the sequence number gets increased, and the save state logic
will reset the offset to the lower number
License
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.
Tests
Added unit test