My English is not very good, but I'll try.
So, I'm working on a firewall solution and would like to share the experience with jqgrid. I get the data remotely in json format, but i manage the information only in memory (client side). For this reason I needed to use the "loadonce" and use clientArray in editUrl. And I save everything (with ajax) in the end (save button).

The difficulty was that i get the data sorted by the server. But, to update "grouping" a need a "reloadGrid" after insert, edit, clone or delete operations.  I can not sort by "groupField" but by "id" (rowid).  I tried various settings to disable sorting on the client side.

So I made a change in jqgrid.

---- my jqGrid def

           groupingView : {
              groupField : ['inPol'],
              groupColumnShow : [false],
              groupCollapse : false,
              groupDataSorted : false,
              groupSorted: false,
              groupText : ['<b>{0}</b>  {1}']

           },

----

The new option is "groupSorted".
I can disable grouping client sort in this way.

The change in jquery.jqGrid.min.js was very simple...

...if(a.p.grouping){if(u.groupSorted===true){r.orderBy(C,u.groupOrder[0],p[0].stype,p[0].srcfmt)};u.groupDataSorted=true}...
...k=d.groupCollapse?d.plusicon:d.minusicon,l,r,m;if(!d.groupDataSorted && d.groupSorted===true){d.sortitems[0].sort();...

I saw that other people have also had the same problem.
How the change is minimal, I would propose this as a patch for future versions. So no need to change manually when upgrading too.

Thanks