The following mouse events are defined when the mouse pointer is in the window of either a file or a directory list:
Scrolls a file or directory list ’proportionally’.
Scrolls a file or directory list ’absolutely’.
Scrolls a file or directory list one page up/down if the button was pressed in the upper/lower half of the list.
Selects the file and closes the File Selection popup.
Causes the contents of this directory to be displayed.