Allow in place operators to modify coordinates#5214
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Replacing the coordinates property of a mesh is not allowed for lots of good reasons.
However, the Python implementation of in place operators does assignment. That is to say:
is equivalent to:
This triggers the error even though
mesh.coordinates.__iadd__returnsmesh.coordinates. This PR relaxes the error check so that assigningmesh.coordinatesitself (i.e. a no-op) is allowed.