Restore review-flagged comment content cut too aggressively in comment reduction

src/core/view/view_mode_model.cpp

@@ -283,6 +283,9 @@ std::set<std::string> ViewModeModel::visibleTracks(const FolderTree& tree,
     std::map<std::string, std::string> parentOf;
     for (const auto& node : tree.nodes) parentOf[node.guid] = node.parentGuid;
 
+    // Seed from the full pass-1 set (not just leaves) so a parent already visible by
+    // its own membership still propagates visibility up its remaining ancestors; a
+    // snapshot copy so mid-loop insertions into `visible` are never re-walked.
     const std::vector<std::string> seeds(visible.begin(), visible.end());
     for (const auto& node : seeds) {
         auto it = parentOf.find(node);