docs: def sizeHint(self, option, index):
          """
          Returns the size hint for the inputed index.
          
          :param      option  | <QStyleOptionViewItem>
                      index   | <QModelIndex>
          
          :return     <QtCore.QSize>
          """
          size = super(XTreeWidgetDelegate, self).sizeHint(option, index)
          
          tree = self.parent()
          item = tree.itemFromIndex(index)
          
          try:
              fixed_height = item.fixedHeight()
          except:
              fixed_height = 0
          
          if fixed_height:
              size.setHeight(fixed_height)
          
          return size