Advances the iterator to the next cluster in the glyph item.
See pango.glyph_item_iter.GlyphItemIter for details of cluster orders.
true if the iterator was advanced, false if we were already on the last cluster.
Advances the iterator to the next cluster in the glyph item.
See pango.glyph_item_iter.GlyphItemIter for details of cluster orders.