[Bug] debug render process fail

[androidminds]

step:

1. clone and install the project
2. open with vscode
3. add a breakpoint at some line of the index.ts (main process)
4. start debugging
5. vs code stop at the breakpoint and everthing looks normal
   but:
6. add a new function in the HelloWorld.vue, binding it with a button's click event
7. add a breakpoint in this function and start debugging
8. click the button, and program will stop at the breakpoint. But you can not execute 'single step' or 'watch variables'.