Fixes: U4-5676 Styling in template editors is poor with the scrollbars and padding , the problem was due to a few too many umb-scrollables defined which causes multiple resizing, this should also improve the UI performance for legacy editors. Have also removed the hard coded width/heights in the code editors, have disabled codemirror from autoscaling as well in these editors since that causes additional scrollbars and overhead. Have tested all these changes in all browers and it's much better.