Grouped workspaces within groups are not displayed correctly in MantidPlot

[Martyn Gigg]

From Spencer:

I was hoping the following would group within a group
	CloneWorkspace(fw1WS,'FwHm1')
	group2 = fw21WS +','+ fw22WS
	GroupWorkspaces(InputWorkspaces=group2,OutputWorkspace='FwHm2')
	group3 = fw31WS +','+ fw32WS +','+ fw33WS
	GroupWorkspaces(InputWorkspaces=group3,OutputWorkspace='FwHm3')
	group = 'FwHm1,FwHm2,FwHm3'
	GroupWorkspaces(InputWorkspaces=group,OutputWorkspace='FwHm')
The WS FwHm2 is a group of 2 & FwHm3 a group of 3 when done individually. 
But this combination gives WS FwHm with 6 groups.

[Nick Draper]

We do not allow groups of groups.

if we were we would have consider the following areas:

1. Correct display in the workspace browser (which gives us plenty of trouble already)
2. Processing the recursive groups in the algorithm base class?
3. What we do with matched pair processing?
4. Saving to Nexus would flatten the hierarchy and reloading would not match.

[Stuart Campbell]

This ticket has been transferred to github issue ​3595