the index of a line, which must be between 0 and <literal>pango_layout_get_line_count(layout) - 1</literal>, inclusive.
the requested PangoLayoutLine, or NULL if the index is out of range. This layout line can be ref'ed and retained, but will become invalid if changes are made to the gtk.Layout No changes should be made to the line.
1.16
Retrieves a particular line from a gtk.Layout
This is a faster alternative to Layout.getLine, but the user is not expected to modify the contents of the line (glyphs, glyph widths, etc.).