@NotNull
  protected ContentManager getProblemsViewContentManager(@NotNull Project project) {
    ToolWindow toolWindow = Objects.requireNonNull(ProblemsView.getToolWindow(project));
    ContentManager contentManager = toolWindow.getContentManager();
    ContentManagerWatcher.watchContentManager(toolWindow, contentManager);
    return contentManager;
  }
@NotNull
  protected ContentManager getProblemsViewContentManager(@NotNull Project project)