Document::page_iter misses pages if Kids array is an indirect reference

[zyxw59]

lopdf version: 0.35.0

If a page table in the document has an indirect reference for its Kids array, that reference will not be followed, so those children in the page tree will be skipped.

I've attached a minimal document which renders correctly with one page in a PDF viewer, but Document::page_iter will return no pages

test.pdf

[zyxw59]

I think the fix for this is just changing

lopdf/src/document.rs

Line 629 in 80a6c50

.and_then(|page_tree| page_tree.get(b"Kids"))

to use page_tree.get_deref(b"Kids", doc) instead of page_tree.get(b"Kids")