Capability to keep a column visible (between 2 searchs)

[malapert]

When a user connects to a client interface and makes a search (using a form), he gets in a livegrid for each entry the value of the default columns.
If he wants to see additional information, he can add them by checking their name in the provided list of other possible visible columns.
But when he does a new search, the additional columns are not shown anymore : he gets the default column again.
For example :
1-go to medoc-sdo.ias.u-psud.fr & select the only form
2-launch 'Search'
3- Add a column you wish to see (recnum )
4-Modify the search (ex select wave = 304 ) & launch search
=> recnum is not anymore visible
The expected behaviour would make recnum stay visible
NB : this should be only available for the current session