OpenGrid subgrid scrollbar issue

by Michael Sobczak

HTML

<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/redmond/jquery-ui.css">
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<link rel="stylesheet" href="https://rawgit.com/free-jqgrid/jqGrid/master/css/ui.jqgrid.css">
<script src="https://rawgit.com/free-jqgrid/jqGrid/master/js/jquery.jqgrid.src.js"></script>
<table id="jqGrid"></table>
<div id="jqGridPager"></div>

JavaScript

var mainGrid = {
  "total": 1,
  "page": 1,
  "pageSize": 20,
  "records": 1,
  "rows": [{
    "siteId": 12516086,
    "siteName": "Detroit",
    "siteAddress": "1 Woodward",
    "siteCitySt": "Detroit, MI",
    "siteZip": "48205",
    "productCd": "ProductX",
    "productName": "Product X",
    "finishedSize": null,
    "estimatedPieceWeight": 0.125,
    "vdpTypeCode": null,
    "taHouseholds": 1071689,
    "taDistribution": 445139,
    "distribution": 445139,
    "avgCpm": 32.32084084084084084084084084084084084084,
    "investment": 19542.8,
    "coverage": 41.54
  }]
};

var subGridData = {
  "total": 1,
  "page": 1,
  "pageSize": 20,
  "records": 2,
  "rows": [{
    "mediaPlanId": 3003,
    "mbuHdrId": 4035986,
    "mbuDtlId": 10442611,
    "commonMbuId": 99731,
    "ggId": 1244425,
    "fkGeoProfileId": 15032061,
    "fkSite": 12516086,
    "wrapZoneId": 15049936,
    "wrapZone": "MI Detroit/ Highland Park/ Hamtramck",
    "productCd": "INS_SHARED",
    "productName": "Insert - Shared Mail",
    "wrapPagePosition": null,
    "finishedSize": null,
    "estimatedPieceWeight": 0.125,
    "vdpTypeCode": null,
    "geocode": "48205D1",
    "zip": "48205",
    "atz": "D1",
    "cityName": "DETROIT, MI",
    "households": 2088,
    "taHouseholds": 2088,
    "distribution": 2092,
    "cpm": 0,
    "investment": 0.0,
    "overallCoverage": 100.191570881226053639846743295019157088,
    "taCoverage": 100.191570881226053639846743295019157088,
    "distance": 0.62,
    "coverageDescDisplay": "Pcd",
    "coverageDesc": "Private Carrier Delivery",
    "ihDate": 1463371200000,
    "ihDay": "M/T",
    "pricingMarket": "MI DETROIT",
    "fkSdmId": 15075973,
    "sdmName": "MI Detroit",
    "fkVariableId": 7039,
    "primaryVariableName": "Candy & Chewing Gum",
    "variableContents": "INDEX",
    "variableValue": 63.52,
    "isSelected": true,
    "isActiveMbuCmn": true,
    "isActiveMbuHdr": true,
    "isActiveMbuDtl": true,
    "isUsedInCbx": true,
    "isBought": true,
   ...