LibPDF: Keep track of OutlineItem parents

While OutlineItem had a parent field, it was never populated nor used.
This commit populates it when possible (no parent means the OutlineItem
is a top-level item).

1 files changed, 3 insertions, 0 deletions

diff --git a/Userland/Libraries/LibPDF/Document.cpp b/Userland/Libraries/LibPDF/Document.cpp
index 5dac546ac5..6b0fd04973 100644
--- a/Userland/Libraries/LibPDF/Document.cpp
+++ b/Userland/Libraries/LibPDF/Document.cpp
@@ -273,6 +273,9 @@ PDFErrorOr<NonnullRefPtr<OutlineItem>> Document::build_outline_item(NonnullRefPt
         VERIFY(outline_item_dict->contains(CommonNames::Last));
         auto first_ref = outline_item_dict->get_value(CommonNames::First);
         auto children = TRY(build_outline_item_chain(first_ref));
+        for (auto& child : children) {
+            child.parent = outline_item;
+        }
         outline_item->children = move(children);
     }