@var{window}.
@end defun
-@defun posn-at-x-y x y &optional frame-or-window
+@defun posn-at-x-y x y &optional frame-or-window whole
This function returns position information corresponding to pixel
coordinates @var{x} and @var{y} in a specified frame or window,
@var{frame-or-window}, which defaults to the selected window.
The coordinates @var{x} and @var{y} are relative to the
frame or window used.
+If @var{whole} is @code{nil}, the coordinates are relative
+to the window text area, otherwise they are relative to
+the entire window area including scroll bars, margins and fringes.
@end defun
These functions are useful for decoding scroll bar events.