Avoid using two temporary vectors when not necessary. #16454
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While looking at https://github.com/dealii/dealii/pull/16290/files/22fd785bc3c0cda5b3425969537c96caa0258326#diff-e6a16110ee8ac3a505be6f066978f72c7d553c75f863760eb17a48ccd0535640, I was checking the existing code and realized that that could be done better.
This is the place where
DataOutcopies a solution vector into its own, internally stored, vector. By default, this is done using two temporary vectors, but if the scalar types in question match, we can do this with just one temporary vector I believe.