Fix compatibility with protobuf v30 (cpp 6.30.0) (#677)

Signed-off-by: bill ross <4451962+bill997@users.noreply.github.com>
Co-authored-by: bill ross <4451962+bill997@users.noreply.github.com>
Co-authored-by: Ian Chen <ichen@openrobotics.org>
(cherry picked from commit e1eb227)

Author: 3 people

src/plugins/topic_viewer/TopicViewer.cc

@@ -256,12 +256,13 @@ void TopicViewerPrivate::AddField(QStandardItem *_parentItem,
     auto messageType = msgField->message_type();
 
     if (messageType)
-      this->AddField(msgItem, msgField->name(), messageType->full_name());
+      this->AddField(msgItem, std::string(msgField->name()),
+          std::string(messageType->full_name()));
 
     else
     {
-      auto msgFieldItem = this->FactoryItem(msgField->name(),
-                                            msgField->type_name());
+      auto msgFieldItem = this->FactoryItem(std::string(msgField->name()),
+                                            std::string(msgField->type_name()));
       msgItem->appendRow(msgFieldItem);
 
       this->SetItemPath(msgFieldItem);