Add support for outline items, in the default viewer, which default to collapsed when the outline is built #10890
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The PDF specification supports this feature, which is commonly used in large/long documents (such as the spec itself), and it seems reasonably straightforward to implement; see https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#G11.2095911