[bugfix] Add missing specialization FieldTraits<MultiTypeBlockMatrix>
- Jan 16, 2023
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Carsten Gräser authored
Notice that this also fixes an incorrect `MultiTypeBlockMatrix::field_type` in a special setting: If you have a nested matrix `MultiTypeBlockMatrix< MultiTypeBlockVector<MultiTypeBlockMatrix<...>>>`, the outer `MultiTypeBlockMatrix::field_type` forwards to the `MultiTypeBlockVector::field_type` which forwards to the inner `FieldTraits<MultiTypeBlockMatrix>::field_type`.
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