Not use jsconfig.json in subfolder

[zhuscat]

Info

• Platform: macOS
• Vetur version: v0.12.6
• VS Code version: 1.27.2

Problem

Here is the structure of my project:

root
├── h5
│   └── jsconfig.json
└── pc
    └── jsconfig.json

And I specify some path aliases in jsconfig.json.

The.js files in h5 and pc can have IntelliSense, but .vue files seems not.

[octref]

Tracked in #423. Currently you have to open h5 / pc as two windows.