[JENKINS-64972] Help-buttons are not working when they are at the top of draggable div (#5316)
* [JENKINS-64972] Help-buttons are not working when they are at the top of draggable div The 'dd-handle' div will make all events in that div (e.g. click event of a button) not triggered, so I move the help-button out of the 'dd-handle' div. In order to make the button still at the right of the same line, I use flex to realize. * [JENKINS-64972] Move style to CSS file