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Any news on this bug? http://dhtmlx.com/docs/products/kb/index.php?s=normal&q=12070&a=19510

In relation to the mentioned issue

a) If you are control xml (data) generation you can change it as
   <div style="height:20px; overflow:hidden; width:100%;">... old content here ... </div>
It will generate expected result in all browsers. 

b) If you need to preserve incoming data as is and in same time fix the height of the row in the browser, you can use 

eXcell_ro.prototype.setValue = function(val){
       val =  "<div style="height:20px; overflow:hidden; width:100%;">" +val+ "</div>";
      dhtmlXGridCellObject.prototype.setValue.call(this,val);
}

it will auto-wrap all data for "ro" columns.