gdk:drag-motion (context window protocol x y suggested possible time)

context -- a gdk:drag-context object
window -- a new gdk:window destination window, obtained by the gdk:drag-find-window-for-screen function
protocol -- a gdk:drag-protocol DND protocol in use, obtained by the gdk:drag-find-window-for-screen function
x -- an integer for the x position of the pointer in root coordinates
y -- an integer for the y position of the pointer in root coordinates
suggested -- a gdk:drag-action value for the suggested action
possible -- a gdk:drag-action value for the possible actions
time -- an unsigned integer for the timestamp for this operation

Updates the drag context when the pointer moves or the set of actions changes. This function is called by the drag source.