a glib.slist.SList containing the lines in the layout. This points to internal data of the pango.layout.Layout and must be used with care. It will become invalid on any change to the layout's text or properties. No changes should be made to the lines.
Returns the lines of the layout as a list.
This is a faster alternative to pango.layout.Layout.getLines, but the user is not expected to modify the contents of the lines (glyphs, glyph widths, etc.).