Program: 70647
Project: 70647
Buggy source:
public FontField(String label){
  super(label,new JComboBox<Font>());
  myBold=new JToggleButton("String_Node_Str");
  myBold.setFont(new Font(Font.SERIF,Font.BOLD,myBold.getFont().getSize()));
  myItalic=new JToggleButton("String_Node_Str");
  myItalic.setFont(new Font(Font.SERIF,Font.ITALIC,myItalic.getFont().getSize()));
  myFontSize=new JComboBox<Integer>();
  int[] fontSizes={8,9,10,11,12,14,16,18,20,22,24,26,28,32,36,48,64,72};
  myFontSize.setSelectedItem(DEFAULT_FONT_SIZE);
  Dimension dim=myFontSize.getPreferredSize();
  myFontSize.setPreferredSize(new Dimension(48,(int)(dim.getHeight())));
  for (  int i : fontSizes) {
    myFontSize.addItem(i);
  }
  myFontSize.setEditable(true);
  super.add(myFontSize);
  super.add(myBold);
  super.add(myItalic);
  Font[] systemFonts=GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
  ArrayList<Font> fonts=new ArrayList<Font>(systemFonts.length + 3);
  fonts.add(new Font(Font.SERIF,0,FONT_DISPLAY_SIZE));
  fonts.add(new Font(Font.SANS_SERIF,0,FONT_DISPLAY_SIZE));
  fonts.add(new Font(Font.MONOSPACED,0,FONT_DISPLAY_SIZE));
  for (  Font f : systemFonts) {
    fonts.add(f.deriveFont((float)FONT_DISPLAY_SIZE));
  }
  @SuppressWarnings("String_Node_Str") JComboBox<Font> fontBox=(JComboBox<Font>)getMajorComponent(label == null ? 0 : 1);
  myComboBox=fontBox;
  myComboBox.setRenderer(new DefaultListCellRenderer(){
    private static final long serialVersionUID=-755738510066156775L;
    @Override public Component getListCellRendererComponent(    JList<?> list,    Object value,    int index,    boolean isSelected,    boolean cellHasFocus){
      Font font=null;
      if (value != null) {
        font=(Font)value;
        value=font.getName();
      }
      Component comp=super.getListCellRendererComponent(list,value,index,isSelected,cellHasFocus);
      if (font != null) {
        comp.setFont(font);
      }
      return comp;
    }
  }
);
  for (  Font f : fonts) {
    myComboBox.addItem(f);
  }
  dim=myComboBox.getPreferredSize();
  myComboBox.setPreferredSize(dim);
  myComboBox.repaint();
  fontBase=fonts.get(0);
  fontSize=DEFAULT_FONT_SIZE;
  fontStyle=DEFAULT_FONT_STYLE;
  updateDisplay();
  ActionListener fontUpdate=new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      if (!myMasked) {
        Font base=(Font)myComboBox.getSelectedItem();
        Float f=(Float)(myFontSize.getSelectedItem());
        int size=(int)f.intValue();
        int style=0;
        if (myBold.isSelected()) {
          style|=Font.BOLD;
        }
        if (myItalic.isSelected()) {
          style|=Font.ITALIC;
        }
        Font value=base.deriveFont(style,size);
        Object validValue=validateValue(value,null);
        if (validValue != value) {
          updateDisplay();
        }
        if (updateValue(validValue)) {
          updateDisplay();
        }
      }
    }
  }
;
  myComboBox.addActionListener(fontUpdate);
  myComboBox.setFocusable(false);
  myFontSize.addActionListener(fontUpdate);
  myFontSize.setFocusable(false);
  myBold.addActionListener(fontUpdate);
  myBold.setFocusable(false);
  myItalic.addActionListener(fontUpdate);
  myItalic.setFocusable(false);
}

Fixed version (ground truth):
public FontField(String label){
  super(label,new JComboBox<Font>());
  myBold=new JToggleButton("String_Node_Str");
  myBold.setFont(new Font(Font.SERIF,Font.BOLD,myBold.getFont().getSize()));
  myItalic=new JToggleButton("String_Node_Str");
  myItalic.setFont(new Font(Font.SERIF,Font.ITALIC,myItalic.getFont().getSize()));
  myFontSize=new JComboBox<Integer>();
  int[] fontSizes={8,9,10,11,12,14,16,18,20,22,24,26,28,32,36,48,64,72};
  myFontSize.setSelectedItem(DEFAULT_FONT_SIZE);
  Dimension dim=myFontSize.getPreferredSize();
  myFontSize.setPreferredSize(new Dimension(48,(int)(dim.getHeight())));
  for (  int i : fontSizes) {
    myFontSize.addItem(i);
  }
  myFontSize.setEditable(true);
  super.add(myFontSize);
  super.add(myBold);
  super.add(myItalic);
  Font[] systemFonts=GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
  ArrayList<Font> fonts=new ArrayList<Font>(systemFonts.length + 3);
  fonts.add(new Font(Font.SERIF,0,FONT_DISPLAY_SIZE));
  fonts.add(new Font(Font.SANS_SERIF,0,FONT_DISPLAY_SIZE));
  fonts.add(new Font(Font.MONOSPACED,0,FONT_DISPLAY_SIZE));
  for (  Font f : systemFonts) {
    fonts.add(f.deriveFont((float)FONT_DISPLAY_SIZE));
  }
  @SuppressWarnings("String_Node_Str") JComboBox<Font> fontBox=(JComboBox<Font>)getMajorComponent(label == null ? 0 : 1);
  myComboBox=fontBox;
  myComboBox.setRenderer(new DefaultListCellRenderer(){
    private static final long serialVersionUID=-755738510066156775L;
    @Override public Component getListCellRendererComponent(    JList<?> list,    Object value,    int index,    boolean isSelected,    boolean cellHasFocus){
      Font font=null;
      if (value != null) {
        font=(Font)value;
        value=font.getName();
      }
      Component comp=super.getListCellRendererComponent(list,value,index,isSelected,cellHasFocus);
      if (font != null) {
        comp.setFont(font);
      }
      return comp;
    }
  }
);
  for (  Font f : fonts) {
    myComboBox.addItem(f);
  }
  dim=myComboBox.getPreferredSize();
  myComboBox.setPreferredSize(dim);
  myComboBox.repaint();
  fontBase=fonts.get(0);
  fontSize=DEFAULT_FONT_SIZE;
  fontStyle=DEFAULT_FONT_STYLE;
  updateDisplay();
  ActionListener fontUpdate=new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      if (!myMasked) {
        Font base=(Font)myComboBox.getSelectedItem();
        int size=(int)((Number)(myFontSize.getSelectedItem())).intValue();
        int style=0;
        if (myBold.isSelected()) {
          style|=Font.BOLD;
        }
        if (myItalic.isSelected()) {
          style|=Font.ITALIC;
        }
        Font value=base.deriveFont(style,size);
        Object validValue=validateValue(value,null);
        if (validValue != value) {
          updateDisplay();
        }
        if (updateValue(validValue)) {
          updateDisplay();
        }
      }
    }
  }
;
  myComboBox.addActionListener(fontUpdate);
  myComboBox.setFocusable(false);
  myFontSize.addActionListener(fontUpdate);
  myFontSize.setFocusable(false);
  myBold.addActionListener(fontUpdate);
  myBold.setFocusable(false);
  myItalic.addActionListener(fontUpdate);
  myItalic.setFocusable(false);
}