flutter-idea/src/io/flutter/performance/FlutterPerformanceView.java [83:99]:
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  private void updateForEmptyContent(ToolWindow toolWindow) {
    // There's a possible race here where the tool window gets disposed while we're displaying contents.
    if (toolWindow.isDisposed()) {
      return;
    }

    toolWindow.setIcon(FlutterIcons.Flutter_13);

    // Display a 'No running applications' message.
    final ContentManager contentManager = toolWindow.getContentManager();
    final JPanel panel = new JPanel(new BorderLayout());
    final JBLabel label = new JBLabel("No running applications", SwingConstants.CENTER);
    label.setForeground(UIUtil.getLabelDisabledForeground());
    panel.add(label, BorderLayout.CENTER);
    emptyContent = contentManager.getFactory().createContent(panel, null, false);
    contentManager.addContent(emptyContent);
  }
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flutter-idea/src/io/flutter/view/FlutterView.java [838:854]:
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  private void updateForEmptyContent(ToolWindow toolWindow) {
    // There's a possible race here where the tool window gets disposed while we're displaying contents.
    if (toolWindow.isDisposed()) {
      return;
    }

    toolWindow.setIcon(FlutterIcons.Flutter_13);

    // Display a 'No running applications' message.
    final ContentManager contentManager = toolWindow.getContentManager();
    final JPanel panel = new JPanel(new BorderLayout());
    final JBLabel label = new JBLabel("No running applications", SwingConstants.CENTER);
    label.setForeground(UIUtil.getLabelDisabledForeground());
    panel.add(label, BorderLayout.CENTER);
    emptyContent = contentManager.getFactory().createContent(panel, null, false);
    contentManager.addContent(emptyContent);
  }
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