docs: def edit( plugins, parent = None, default = None, modal = True ):
          """
          Prompts the user to edit the config settings for the inputed config \
          plugins.
          
          :param      plugins | [<XConfigPlugin>, ..]
                      parent  | <QWidget>
                      default | <XConfigPlugin> || None
          
          :return     <bool> success
          """
          if ( XConfigDialog._instance ):
              XConfigDialog._instance.show()
              XConfigDialog._instance.activateWindow()
              return True
          
          dlg = XConfigDialog( parent )
          dlg.setPlugins(plugins)
          dlg.setCurrentPlugin(default)
          
          if ( not modal ):
              XConfigDialog._instance = dlg
              dlg.setAttribute(Qt.WA_DeleteOnClose)
              dlg.show()
              return True
              
          if ( dlg.exec_() ):
              return True
          return False