logic: Fixed multiple active symbols broken on undo

* fixed undoing to multiple actives didn't show all nodes in graph
* fixed wrong name in search bar, status message and history dropdown
* fixed flicker when activating multiple nodes in code view

src/lib_gui/qt/element/QtCodeFileList.cpp

@@ -74,6 +74,7 @@ void QtCodeFileList::clear()
 {
 	for (QtCodeFile* file : m_files)
 	{
+		file->hide();
 		file->deleteLater();
 	}