accept-drop-files in window<%>
Enables or disables drag-and-drop dropping for the window (on
platforms that support drag-and-drop), or gets the enable
state. Dropping is initially disabled. See also
on-drop-file .
( -> booleansend a-window accept-drop-files)
Returns #t if file-dropping is enabled, #f otherwise.
( -> void
send a-window accept-drop-files accept-files?)
accept-files? : boolean
Enables file-dropping if accept-files? is true, disables
file-dropping otherwise.