code: def _refresh_outlineexplorer(self, index=None, update=True, clear=False):
          
          oe = self.outlineexplorer
          if oe is None:
              return
          if index is None:
              index = self.get_stack_index()
          if self.data:
              finfo = self.data[index]
              oe.setEnabled(True)
              if finfo.editor.oe_proxy is None:
                  finfo.editor.oe_proxy = OutlineExplorerProxyEditor(
                      finfo.editor, finfo.filename)
              oe.set_current_editor(finfo.editor.oe_proxy,
                                    update=update, clear=clear)
              if index != self.get_stack_index():
                  # The last file added to the outline explorer is not the
                  # currently focused one in the editor stack. Therefore,
                  # we need to force a refresh of the outline explorer to set
                  # the current editor to the currently focused one in the
                  # editor stack. See PR #8015.
                  self._refresh_outlineexplorer(update=False)
                  return
          self._sync_outlineexplorer_file_order()
docs: Refresh outline explorer panel