num-scroll-lines

Reports the number of scroll positions available within the editor.

For text% objects: Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?). If the editor is not displayed and the editor has a maximum width, line breaks are calculated as for line-start-position.

• (send an-editor num-scroll-lines) -> exact non-negative integer