static S getTextTrim(JTextComponent c) {
  ret trim(getText(c));
}

// tested for editable combo box - returns the contents of text field
static S getTextTrim(JComboBox cb) {
  ret trim(getText(cb));
}

static S getTextTrim(JComponent c) {
  if (c instanceof JLabel) ret trim(((JLabel) c).getText());
  if (c instanceof JComboBox) ret getTextTrim((JComboBox) c);
  ret getTextTrim((JTextComponent) c);
}