https://manpages.ubuntu.com/manpages/xenial/man3/XmDropSiteQueryStackingOrder.3.html
Ubuntu Manpage: XmDropSiteQueryStackingOrder - A Drag and Drop function that returns the parent, a...
A Drag and Drop function that returns the parent, a list of children, and the number of children for a specified widget "XmDropSiteQueryStacking\%Order" "Drag...
drag and drop