[2046] Component Files not watched in nested pages

When a component is imported on a multi-nested dynamic page, change the contents of the component is not detected and does not trigger a HMR re-build.

STR 1. Create page structure

pages
- test
- - _x
- - - _y
- - - - index.vue

2. create a test component
3. load the test component from _y/index.vue
4. Change the contents of test component, notice a file watch change does not occur.

Environment Doceker node:8.8.0-alpine

Additional Notes. This bug does not occur when the double nested dynamic directories do not exist. For example, change the _y to y will not experience the same problem.

pages
- test
- - _x
- - - y
- - - - index.vue