message: clean up lit-html parts cache when jsx is used
diff: import { createElement, updateElement, Fragment } from './vdom-my';
  -import { html, render, TemplateResult, svg, directive, EventPart } from 'lit-html';
  +import { html, render, TemplateResult, svg, directive, EventPart, parts } from 'lit-html';
  import { unsafeHTML } from "lit-html/directives/unsafe-html";
  function _render(element, vdom, parent?) {
  if (typeof vdom === 'string') {
  render(html`${unsafeHTML(vdom)}`, element);
  } else if (vdom instanceof TemplateResult) {
  - render(vdom, element)
  + render(vdom, element);
  } else {
  updateElement(element, vdom, parent);
  + parts.delete(element);
  }
  }
  