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Fixes #235.
This code change makes sure to not do any operations that might overflow or underflow.
The code makes the assumption that it does not receive the widget in a broken state, ie the invariant
must be true for the code to be correct. If it is, then the result after the operation will uphold the same invariant.
Such a topic is very error prone, so please feel free to try and find problems in the code I wrote.