Gets the graphical location of the given snip. If the snip is found in the editor, #t is returned; otherwise, #f is returned.
The result is only valid when the editor is displayed (see Basic Organization). For text% objects, calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?).
The x box is filled with the x-coordinate of the snip's location, unless x is #f. The y box is filled with the y-coordinate of the snip's location, unless y is #f.
If bottom-right? is not #f, the values in the x and y boxes are for the snip's bottom right corner instead of its top-left corner.