Auto-complete issue related to file paths

[ProblemFactory]

Description

When using jupyterlab-lsp, the file path autocomplete in str stops working. Also, sometimes it will automatically add useless .ipynb_checkpoints.

Reproduce

Issue 1:

1. type '/' (including quote) in any notebook's code cell
2. then press TAB after /.
3. Nothing happens.

Issue 2:

1. Go to any cell, type in the following code:

from scipy.io import loadmat
data = loadmat('/path/to/some/.mat/file')[0]

2. type . after [0]
3. ipynb_checkpoints will be appended after . symbol.

Expected behavior

Issue 1:
A list of files/folders should pop out for selection.

Issue 2:
Nothing should happen or a valid completion.

Context

• Operating System and version: Windows 10 Pro x64 Version 1909
• Browser and version: Chrome 80.0.3987.149
• JupyterLab version: 2.0.1
• jupyter-lsp version: 0.8.0
• @krassowski/jupyterlab-lsp version: 1.0.0

[antonwnk]

I second both these. While the first one didn't strike me as an issue necessarily (don't know whether I should expect some path completion to begin or not), the second issue is very annoying.
It happens when I type . on an empty line and whenever I put square brackets for indexing.
I.e.

[].   # no completion
existing_or_undefined_variable[].  # completes with .ipynb_checkpoints/
existing_or_undefined_variable[.]  # completes with .ipynb_checkpoints/ even if dot is typed inside

[krassowski]

Thank you @ProblemFactory for reporting and thanks @antonwnk for providing additional examples - it was useful for creating a test case!

I started working on that, and most of the annoying behaviour should be gone in the next release; most likely ETA in two weeks time.

[antonwnk]

Seems you have it covered! Thanks a lot.

[krassowski]

This has been fixed upstream in JupyterLab. If there will be JupyterLab 2.2 release, it will likely be included in it. Otherwise it will be in JupyterLab 3.0