JSFiddle - React, Tailwind, and code Playground

JavaScript

var pos;
switch(pos):
    case 'after':
        sind = $(t).jqGrid('getGridRowById', src);
        if (sind) {
        
            //used this addin variable so the final incremementation will work in both cases
            var addin = 1;
	        if ($(t.rows[sind.rowIndex + 1]).hasClass("ui-subgrid")) { $(t.rows[sind.rowIndex + 1]).after(row.join('')); addin++; }
            else { $(sind).after(row.join('')); }	
		    sind = sind.rowIndex + addin
	    }	
	break;