Selects glyphs in page content order: the order the content streams show them in, every glyph selectable.
public sealed class ContentReadingOrder : IReadingOrderProvider
ISO 32000-2 §14.8.2.5.1 (page content order). Spec #33 viewer capability 4.
kind:method, kind:property, kind:ctor. Press Esc to clear.InstanceGets the provider.GetReadingOrder(PdfPage, HitTestIndex)Gives the selectable glyphs of a page in reading order.