Unexpected behaviour in `PETScVector.__setitem__ `

[Philipp Trunschke]

PETScVector.__setitem__ does not work with slices from numpy arrays:

u = Function(V)
u.vector()[:] = arr[:,0]

does not produce the expected result while

u = Function(V)
u.vector()[:] = np.array(arr[:,0])

does. Strangely enough PETScVector.set_local behaves as expected.

Dolfin version: 2019.1.0