Changelog

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+Fixed: SolverCG used with matrices and preconditioners that support
+interleaving of the vector updates with the matrix-vector product (e.g. with
+certain matrix-free operators) sometimes performed the final update to the
+result vector `x` with a wrong coefficient. This could affect the returned
+solution for coarse tolerances far away from convergence. This is now fixed.
+<br>
+(Martin Kronbichler, 2023/02/26)