操作系统：Mac OS X
NW.js 版本（最新 0.20，尝试从 0.14 到最新）
Issue:
Application freezes(UI becomes unresponsive) after doing following steps:
- Open application
- Use functionality which trigger code "window.print()", print dialog comes up. User may print/cancel it.
- Keep application idle for some time(3-5 mins) and now app freezes(Rendered process freezes and UI becomes unresponsive).
Nw.js 论坛上也提出了问题： https ://github.com/nwjs/nw.js/issues/5020
有人遇到过这样的问题吗？有关解决此类问题的任何提示？