Initializes a `PangoGlyphItemIter` structure to point to the last cluster in a glyph item.
See `PangoGlyphItemIter` for details of cluster orders.
| this |
a `PangoGlyphItemIter` |
| glyph_item |
the glyph item to iterate over |
| text |
text corresponding to the glyph item |
|
false if there are no clusters in the glyph item |