Minor IBA python binding internal refactor: vecresize utility #3757
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There's a recurring idiom spread all over the python bindings for ImageBufAlgo, which I encapsulate in a new local helper template vecresize(). This ensures that the logic is identical in all the places it's used, and also improves our coverage analysis (because it was tricky to make tests that exercise the uninitialized-handling cases separately for each of the many different places the idiom was used).