Decides the order a page's glyphs are selected and copied in: the replaceable seam between the hit-test index (glyphs in content order) and the reading order a text selection follows.
public interface IReadingOrderProvider
ISO 32000-2 §14.8.2.5 (page content order and logical content order). Built-in providers: ContentReadingOrder (page content order) and LayoutReadingOrder (the layout tree's order: structure order on tagged pages, detected columns and paragraphs on untagged ones). Spec #33 viewer capability 4.
kind:method, kind:property, kind:ctor. Press Esc to clear.GetReadingOrder(PdfPage, HitTestIndex)Gives the selectable glyphs of a page in reading order.