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Hello,
Apologies for the delay.
Currently it’s not supported.
If you want to do yourself, i can give some hints.
https://stackoverflow.com/questions/8300524/jqgrid-grouping-state-when-filtering/8317759#8317759
In onClickGroup event, you can save which header-id is expanded and save in cookie or browser storage. And in loadComplete you can again toggle that header-id by reading from cookie or storage.
$opt[“onClickGroup”] = “function(hid, collapse) { …. }”;
$opt[“loadComplete”] = “function() { …. }”;
//…
$g->set_options($opt);
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