defines that during event resizing the end date of the event can be swapped for the start date (after the end date becomes scheduled before the start one)
Available only in PRO Edition
scheduler.config.timeline_swap_resize = false;
added in version 4.4
If the property is set to false, it won't allow you to drag the end date to the left of the start date (and vice versa) when you resize event via drag and drop.