Given a graphical location in the editor, returns the item editor position at that location.
The result is only valid when the editor is displayed (see Basic Organization). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).
See End of Line for a discussion of the at-eol? argument. The on-it? box is filled with #t if the line actually touches this position, or #f otherwise, unless on-it? is #f.
The edge-close? box is filled with it will be filled in with a value indicating how close the point is to the vertical edges of the item when the point falls on the item, unless edge-close? is #f. If the point is closest to the left edge of the item, the value will be negative; otherwise, the value will be positive. In either case, then absolute value of the returned result is the distance from the point to the edge of the item. The values 100 and -100 indicate infinity.