Make Annot::getNF and Dict::getNF return const & instead of copy

Lots of users can deal with a const & directly, so it saves us some
copying. For the ones that can't move the copy to the caller side.

Some of copy() on the caller side can be easily removed, that will come
on next commits

1 files changed, 2 insertions, 2 deletions

diff --git a/glib/poppler-document.cc b/glib/poppler-document.cc
index ed37da4c..38699e2f 100644
--- a/glib/poppler-document.cc
+++ b/glib/poppler-document.cc
@@ -2845,7 +2845,7 @@ get_optional_content_rbgroups (OCGs *ocg)
       for (j = 0; j < rb_array->getLength (); ++j) {
 	OptionalContentGroup *oc;
 
-        Object ref = rb_array->getNF (j);
+        const Object &ref = rb_array->getNF (j);
 	if (!ref.isRef ()) {
 	  continue;
 	}
@@ -2888,7 +2888,7 @@ get_optional_content_items_sorted (OCGs *ocg, Layer *parent, Array *order)
     Object orderItem = order->get (i);
 
     if (orderItem.isDict ()) {
-      Object ref = order->getNF (i);
+      const Object &ref = order->getNF (i);
       if (ref.isRef ()) {
         OptionalContentGroup *oc = ocg->findOcgByRef (ref.getRef ());
 	Layer *layer = layer_new (oc);