Reorder items from logical order to visual order.
The visual order is determined from the associated directional levels of the items. The original list is unmodified.
(Please open a bug if you use this function. It is not a particularly convenient interface, and the code is duplicated elsewhere in Pango for that reason.)
| items |
a `GList` of `PangoItem` in logical order. |
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a `GList` of `PangoItem` structures in visual order. |