RE #28227 Correct colorbar when normalisation changes

The colour bar was reset to -0.1 and +0.1 when the normalistion was
changed. This reperforms the setting of the colour bar to the max and
min values in the workspace.

qt/applications/workbench/workbench/plotting/figureinteraction.py

@@ -12,6 +12,7 @@ Defines interaction behaviour for plotting.
 from __future__ import (absolute_import, unicode_literals)
 
 # std imports
+import numpy as np
 from collections import OrderedDict
 from copy import copy
 from functools import partial
@@ -704,6 +705,12 @@ class FigureInteraction(object):
         if ax.lines:  # Relim causes issues with colour plots, which have no lines.
             ax.relim()
 
+        if ax.images:  # Colour bar limits are wrong if workspace is ragged. Set them manually.
+            colorbar_min = np.nanmin(ax.images[-1].get_array())
+            colorbar_max = np.nanmax(ax.images[-1].get_array())
+            for image in ax.images:
+                image.set_clim(colorbar_min, colorbar_max)
+
         ax.autoscale()
 
         datafunctions.set_initial_dimensions(ax)