Not changing normalisation of spectra with errorbars added post-plotting

[RichardWaiteSTFC]

Describe the bug Problem with normalisation when you plot two spectra and set the errorbars to be visible on one then change normalisation to None - it looks like it doesn't change the normalisation of the spectrum that errrobars were added to (on IDAaaS).

To Reproduce (1) Load data (e.g. MAR11060) (2) Plot first two spectra without errors (3) Right-click on plot > Error Bars > check box next to first spectra (4) Right-click > Normalisation > None

The normalisation of the spectrum without errorbars is changed, but not the spectrum with errorbars. You can check by making the figure again and not adding errorbars before changing the normalisation (see LHS of screeenshot - two curves should have similar shapes).

Expected behavior Normalisation of all plotted spectra changed

Platform/Version (please complete the following information):

• mantid nightly - but seen in v6.2 release

Additional context