Value is a list (HEIGHT VPOS YPOS OFFBOT), where HEIGHT is the height
in pixels of the visible part of the line, VPOS and YPOS are the
-vertical position in lines and pixels of the row, relative to the top
+vertical position in lines and pixels of the line, relative to the top
of the first text line, and OFFBOT is the number of off-window pixels at
-the bottom of the text row. If there are off-window pixels at the top
-of the (first) text row, YPOS is negative.
+the bottom of the text line. If there are off-window pixels at the top
+of the (first) text line, YPOS is negative.
Return nil if window display is not up-to-date. In that case, use
`pos-visible-in-window-p' to obtain the information. */)