code: def open_fileswitcher(self, symbol=False):
          
          if self.fileswitcher is not None and \
            self.fileswitcher.is_visible:
              self.fileswitcher.hide()
              self.fileswitcher.is_visible = False
              return
          if symbol:
              self.fileswitcher.plugin = self.editor
              self.fileswitcher.set_search_text('@')
          else:
              self.fileswitcher.set_search_text('')
          self.fileswitcher.show()
          self.fileswitcher.is_visible = True
docs: Open file list management dialog box.