All the 'editorHeight' property value is reset as 24 in the 'jquery.easyui.theme.v1.js' file that can be download from
https://www.jeasyui.com/extension/themes_older.php. Please include it to the page before the 'edatagrid' plugin.
<script type="text/javascript" src="./themes/jquery.easyui.theme.v1.js"></script>
<script type="text/javascript" src="./jquery.edatagrid.js"></script>