Transpose in slice viewer non-orthogonal view not displaying data correctly

[DannyHindson]

Run this script:

# import mantid algorithms, numpy and matplotlib
from mantid.simpleapi import *
import matplotlib.pyplot as plt
import numpy as np

md_4D = CreateMDWorkspace(Dimensions=4, Extents=[0,2,-1,1,-1.5,1.5,-0.25,0.25], Names="H,K,L,E", Frames='HKL,HKL,HKL,General Frame',Units='r.l.u.,r.l.u.,r.l.u.,meV')
FakeMDEventData(InputWorkspace=md_4D, UniformParams='5e5') # 4D data
tmp = CreateMDWorkspace(Dimensions=4, Extents=[0.25,0.75,-1,-0.5,-1.5,-1, -0.25,0], Names="H,K,L,E", Frames='HKL,HKL,HKL,General Frame',Units='r.l.u.,r.l.u.,r.l.u.,meV')
FakeMDEventData(InputWorkspace=tmp, UniformParams='1e5') # 4D data
md_4D += tmp
DeleteWorkspace(tmp)

# Add a non-orthogonal UB
expt_info = CreateSampleWorkspace()
md_4D.addExperimentInfo(expt_info)
SetUB(Workspace='md_4D', c=2, gamma=120)

# make a 3D MDEvent workspace by integrating over all E
md_3D = SliceMD(InputWorkspace='md_4D', AlignedDim0='H,0,2,100', AlignedDim1='K,-1,1,100', AlignedDim2='L,-1.5,1.5,100')

Note that the K data has limits -1 to +1 Then transpose H and K. The K data is shown as extending from -0.5 to +0.5 now:

[DannyHindson]

Also worth adding a test to the manual testing instructions to cover this