Remove intra doc link items if they are private/hidden and the matching option is not enabled

Author: GuillaumeGomez

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1216,6 +1216,22 @@ impl LinkCollector<'_, '_> {
         .emit();
     }
 
+    fn filter_private_hidden_candidates(&self, candidates: &mut Vec<(Res, Option<DefId>)>) {
+        candidates.retain(|(candidate, _)| {
+            let Res::Def(_, def_id) = candidate else { return true };
+
+            if !self.cx.render_options.document_private
+                && !self.cx.tcx.visibility(def_id).is_public()
+            {
+                false
+            } else if !self.cx.render_options.document_hidden && self.cx.tcx.is_doc_hidden(def_id) {
+                false
+            } else {
+                true
+            }
+        });
+    }
+
     fn resolve_with_disambiguator_cached(
         &mut self,
         key: ResolutionInfo,
@@ -1250,6 +1266,8 @@ impl LinkCollector<'_, '_> {
             }
         }
 
+        self.filter_private_hidden_candidates(&mut candidates);
+
         // If there are multiple items with the same "kind" (for example, both "associated types")
         // and after removing duplicated kinds, only one remains, the `ambiguity_error` function
         // won't emit an error. So at this point, we can just take the first candidate as it was