Renaming file will burn down LSP

[hujianxin]

Environment data

• VS Code 1.32.1:
• Extension version (available under the Extensions sidebar): 2019.2.5558 (6 March 2019)
• OS and version: Ubuntu 16.04
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.1
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): pipenv

Expected behaviour

Rename a python file in VSCode sidebar, goto definition of LSP works fine

Actual behaviour

LSP does not work, and a progress bar above editor is always running

Steps to reproduce:

1. XXX
   touch a.py, b.py

import b.py from a.py

change b.py to c.py

[luabud]

Fixed upstream.